Human Development

Newborn care: immediate care and discharge readiness

Clinical Overview and When to Suspect Discharge Readiness Issues

— Stable vitals ≥12 h (RR <60, HR 100–160, axillary temp 36.5–37.4°C in open crib)

— At least one spontaneous void and stool

— Successful feeding × 2 (latch, swallow, no distress)

— Normal physical exam, no jaundice requiring treatment

— Completed screens: hearing, critical congenital heart disease (CCHD) pulse ox, metabolic/newborn blood spot, glucose if at-risk

— Hep B vaccine offered, vitamin K administered, erythromycin eye prophylaxis given

— Maternal labs reviewed (HBsAg, HIV, RPR, GBS, blood type/Rh, rubella)

— Car seat tolerance screening if <37 weeks

— Identified medical home and follow-up scheduled

Board pearl: the single most common preventable cause of newborn readmission in the first week of life is hyperbilirubinemia, followed by feeding/dehydration issues — both are products of premature discharge without adequate predischarge bilirubin risk stratification and a 48–72 h follow-up visit.

Scope of newborn care: the immediate postnatal period (first minutes to hours) and the predischarge window (typically 24–48 h after vaginal birth, 48–96 h after cesarean) are high-yield Step 3 territory because they integrate APGAR scoring, transitional physiology, universal screening, feeding establishment, and safe transition home.

Epidemiology: ~10% of newborns need some resuscitation assistance; <1% need extensive resuscitation. Late preterm infants (34 0/7–36 6/7 weeks) account for ~70% of preterm births and are at disproportionate risk for feeding failure, hyperbilirubinemia, hypoglycemia, and readmission.

AAP-defined "discharge ready" newborn requires:

When to suspect a problem: any infant who is late preterm, SGA/LGA, IDM, has bruising/cephalohematoma, maternal chorioamnionitis, prolonged ROM ≥18 h, GBS-unknown/positive without adequate intrapartum prophylaxis, or whose mother has untreated/inadequately treated syphilis, HBV, HIV, or active HSV.

Presentation Patterns and Key History

— Infectious: GBS status and adequacy of intrapartum prophylaxis (≥4 h of penicillin/ampicillin/cefazolin before delivery), HBsAg, HIV viral load, syphilis (RPR), HSV lesions, TB, varicella, rubella immunity, chorioamnionitis (maternal fever ≥39°C once or 38–38.9°C plus one other sign)

— Metabolic/obstetric: diabetes (pregestational vs gestational, control), preeclampsia, thyroid disease, SLE/anti-Ro (congenital heart block), substance use (opioids → NAS scoring), SSRI exposure

— Genetic/family: consanguinity, prior infant with metabolic disease or sudden death, hemoglobinopathies, hearing loss

— Respiratory distress in term infant: transient tachypnea of newborn (TTN) — peaks 2–6 h, resolves <24 h; consider RDS if late preterm; meconium aspiration; pneumonia/sepsis; pneumothorax; CDH; choanal atresia (cyanosis relieved by crying)

— Poor feeding/lethargy: sepsis, hypoglycemia, inborn error of metabolism, ductal-dependent CHD, hypothyroidism

— Jaundice <24 h: always pathologic — hemolysis (ABO/Rh), G6PD, sepsis, hereditary spherocytosis

— Bilious emesis: malrotation with volvulus until proven otherwise — urgent UGI

— Failure to pass meconium >24–48 h: Hirschsprung, CF meconium ileus, imperforate anus, hypothyroidism

Step 3 management: for any newborn whose mother had inadequate GBS prophylaxis plus risk factors (chorio, ROM ≥18 h, preterm), follow the AAP neonatal early-onset sepsis calculator or categorical approach — do not simply discharge.

Delivery room scenario: vignette opens with maternal labor course (gestational age, ROM duration, meconium-stained fluid, fever, GBS status, medications), then the moment of birth. You are asked what to do in the first 60 seconds ("golden minute") or to interpret a 1- and 5-minute APGAR.

Maternal history to extract:

Newborn presentation patterns:

Feeding history at discharge: breastfeeding 8–12×/day, ≥1 wet diaper per day of life up to day 5 then ≥6, transitional then yellow seedy stools by day 4–5; formula-fed take 1–2 oz q2–3h by day 3.

Physical Exam Findings and Transitional Physiology

— Head: caput (crosses sutures, resolves days) vs cephalohematoma (subperiosteal, doesn't cross sutures, risk of hyperbilirubinemia) vs subgaleal hemorrhage (boggy, crosses sutures, can exsanguinate — emergency)

— Eyes: red reflex bilaterally (absent → cataract, retinoblastoma, glaucoma)

— Mouth: cleft palate (palpate), Epstein pearls (benign)

— Heart: murmur on day 1 often PDA/PPHN transitional; persistent murmur, abnormal pulses, or differential cyanosis → echo and CCHD workup

— Abdomen: 3-vessel cord (single umbilical artery → renal U/S consideration); palpable kidneys; check for imperforate anus

— GU: undescended testes, hypospadias (do NOT circumcise), ambiguous genitalia (CAH workup)

— Hips: Barlow/Ortolani for DDH; risk = breech, female, family history → U/S at 6 weeks

— Spine: sacral dimple — image if >5 mm, >2.5 cm from anus, hairy tuft, or other midline lesion

— Neuro: Moro, root, suck, grasp, stepping

Key distinction: acrocyanosis (hands/feet blue, trunk pink) is normal in first 24–48 h; central cyanosis (lips/trunk) is always pathologic and demands CCHD pulse ox + echo workup.

Delivery room assessment ("golden minute"): the only three questions — term? tone? breathing/crying? If yes to all → routine care with mother (skin-to-skin, delayed cord clamping 30–60 s). If any no → warm, dry, stimulate, position airway, suction only if needed.

APGAR: assigned at 1 and 5 min; if 5-min score <7, repeat q5 min up to 20 min. APGAR is not used to guide resuscitation and not a predictor of long-term outcome alone — a 5-min APGAR ≤3 plus cord pH <7.0, base deficit ≥12, and multiorgan dysfunction is needed to attribute neurologic injury to intrapartum hypoxia.

Vital sign norms: HR 120–160 (range 100–190 with activity), RR 40–60, axillary T 36.5–37.4°C, BP varies by GA/weight (mean BP ≈ GA in weeks for preterm).

Head-to-toe predischarge exam:

Diagnostic Workup — Universal Screening and Initial Labs

— Newborn metabolic screen (NBS, "PKU card"): heel-stick blood spot at 24–48 h of life (after feeding established to detect PKU, MCAD, etc.); covers ~30–60 conditions depending on state — PKU, congenital hypothyroidism, CAH, galactosemia, CF, SCID, hemoglobinopathies, MCAD, MSUD, biotinidase. Repeat if drawn <24 h or transfused.

— Critical congenital heart disease (CCHD) screen: pulse oximetry on right hand (preductal) AND either foot (postductal) at ≥24 h of life. Pass: ≥95% in both AND <3% difference. Fail (immediate echo): any <90%, OR <95% in both with <3% difference on three measurements 1 h apart, OR ≥3% difference on three measurements.

— Hearing screen: otoacoustic emissions (OAE) or automated auditory brainstem response (AABR) before discharge; rescreen at 1 month if failed; full audiology eval by 3 months; intervention by 6 months ("1-3-6 rule").

— Bilirubin: transcutaneous or total serum bilirubin before discharge on every newborn, plotted on the Bhutani nomogram by hour of life to determine risk zone and follow-up timing.

Board pearl: a newborn whose NBS was drawn before 24 h of life must have a repeat at 1–2 weeks — PKU and several disorders can be falsely negative without adequate protein feeding.

Step 3 management: order predischarge bilirubin + Bhutani zone assignment + scheduled 48–72 h follow-up on every newborn — failure to do this is the most testable safety lapse.

Universal newborn screens (state-mandated, performed predischarge):

At-risk glucose screening: LGA, SGA, IDM, late preterm — point-of-care glucose at 30 min after first feed, then q3h × 24 h (IDM/LGA) or 48 h (preterm/SGA). Target ≥45 mg/dL after first 4 h.

Coombs (DAT) / blood type: obtain from cord blood if mother is O or Rh-negative, or if jaundice appears <24 h.

CBC + CRP + blood culture: only if sepsis risk (chorio, inadequate GBS prophylaxis, symptomatic) — guided by Kaiser EOS sepsis calculator.

Diagnostic Workup — Advanced and Confirmatory Studies

— Repeat TSB on a defined interval (4–24 h depending on zone and age)

— Plot on AAP 2022 phototherapy nomogram (gestational age + neurotoxicity risk factors: isoimmune hemolytic disease, G6PD, asphyxia, sepsis, albumin <3.0, temp instability, lethargy)

— Workup of pathologic jaundice: direct/indirect bilirubin split, blood type, DAT, CBC with smear, reticulocyte count, G6PD (especially Mediterranean, African, Asian descent males), TSH if conjugated

— Direct hyperbili (>1 mg/dL or >20% of total): never physiologic — workup biliary atresia (HIDA, abdominal U/S), TORCH, galactosemia, alpha-1 antitrypsin, neonatal hepatitis

— Renal U/S: single umbilical artery + other anomaly, prenatal hydronephrosis, abnormal voiding

— Hip U/S at 6 weeks: breech, family history of DDH, abnormal exam

— Head U/S: VLBW, suspected IVH, abnormal neuro exam

Key distinction: an infant with conjugated hyperbilirubinemia is never normal — biliary atresia must be diagnosed by 30–45 days for Kasai portoenterostomy to have best outcomes. Acholic stools are a red flag.

When the predischarge bilirubin is high-risk zone or rising rapidly:

Failed CCHD screen: immediate echocardiogram; while awaiting, hyperoxia test (PaO2 <100 on 100% O2 suggests cyanotic CHD); maintain ductal patency with PGE1 if ductal-dependent lesion suspected.

Failed hearing screen: outpatient diagnostic ABR by 3 months; CMV PCR within first 3 weeks of life (congenital CMV is leading non-genetic cause of SNHL — treat with valganciclovir 6 months if symptomatic/SNHL).

Persistent hypoglycemia >48 h: workup for hyperinsulinism, panhypopituitarism, IEM — draw "critical sample" during hypoglycemia (insulin, C-peptide, cortisol, GH, beta-hydroxybutyrate, lactate, FFA, ammonia, acylcarnitine).

Failed car seat tolerance screen (desat, brady, apnea in 90–120 min trial) for preterm/LBW infants: car bed, repeat trial.

Imaging triggers:

Risk Stratification and First-Line Management Logic

— Term, tone, crying → routine care

— Not vigorous → warm/dry/stimulate/position/suction

— Apnea, gasping, or HR <100 → PPV with room air for term, 21–30% O2 for preterm, rate 40–60/min

— HR <100 after 30 s effective PPV → MR SOPA (Mask adjustment, Reposition, Suction, Open mouth, Pressure increase, Airway alternative)

— HR <60 after 30 s effective PPV (preferably via ETT) → chest compressions 3:1 ratio with ventilations, 100% O2, UVC access

— Persistent HR <60 → epinephrine 0.02 mg/kg IV (0.1 mg/kg ETT) q3–5 min, consider volume (NS 10 mL/kg) if hypovolemic

— Asymptomatic >25 mg/dL: feed, recheck in 1 h

— Asymptomatic <25 mg/dL or symptomatic <40: IV D10 bolus 2 mL/kg + infusion 5–8 mg/kg/min

— Persistent: dextrose gel 40% 0.5 mL/kg buccal is first-line adjunct per AAP

CCS pearl: in a depressed newborn after birth, your first three orders are warm/dry/stimulate, position airway, PPV with bag-mask — not intubation, not epinephrine, not labs.

Neonatal Resuscitation Program (NRP) algorithm — first 60 seconds:

Therapeutic hypothermia eligibility: ≥36 weeks GA, within 6 h of birth, evidence of acute peripartum event + moderate-severe encephalopathy → cool to 33.5°C × 72 h.

EOS sepsis stratification: Kaiser EOS calculator integrates GA, max maternal temp, ROM duration, GBS status, intrapartum antibiotics, and infant clinical status → recommends observation, blood culture only, or empirical ampicillin + gentamicin.

Hypoglycemia management:

Hyperbilirubinemia (2022 AAP): treatment thresholds raised vs prior; phototherapy threshold based on GA + neurotoxicity risk; exchange transfusion if TSB above exchange line or signs of acute bilirubin encephalopathy (hypertonia, retrocollis, high-pitched cry).

Pharmacotherapy — Routine Newborn Medications

— Prevents vitamin K deficiency bleeding (VKDB): early (<24 h, maternal anticonvulsants/warfarin), classic (1–7 d), late (2–12 wks, breastfed without prophylaxis, intracranial hemorrhage risk 60%)

— Oral vitamin K is inadequate — AAP and ACOG strongly advise IM; parental refusal warrants documented counseling about late VKDB risk

— Prevents gonococcal ophthalmia neonatorum; does NOT prevent chlamydial conjunctivitis (treat with oral azithromycin/erythromycin if it develops — watch for pyloric stenosis with erythromycin)

— Mandated by most state laws even if mother screened negative

— If mother HBsAg+: HBV vaccine AND HBIG within 12 h, at separate sites; test infant for HBsAg/anti-HBs at 9–12 months

— If maternal HBsAg unknown: vaccine within 12 h, draw maternal HBsAg; if positive, give HBIG within 7 d

— If <2 kg and mother HBsAg negative: delay vaccine to 1 month or hospital discharge

Board pearl: parental refusal of vitamin K is not a contraindication to discharge per se, but document risk/benefit discussion, notify PCP, and arrange close follow-up — late VKDB has 20% mortality.

Vitamin K1 (phytonadione) 1 mg IM within 6 h of birth for every newborn:

Erythromycin 0.5% ophthalmic ointment to both eyes within 24 h:

Hepatitis B vaccine (monovalent, thimerosal-free) within 24 h of birth for ALL infants ≥2 kg:

HIV prophylaxis: if maternal HIV+ — zidovudine for low-risk (VL <50, on ART), 3-drug regimen (ZDV + 3TC + NVP or RAL) for high-risk; start within 6–12 h; avoid breastfeeding in US.

Penicillin G benzathine 50,000 U/kg IM × 1 if maternal syphilis inadequately treated.

Naloxone is NOT recommended in NRP for opioid-exposed newborns — focus on ventilation.

Procedures — Circumcision, Cord Care, and Predischarge Skills

— Discuss risks (bleeding, infection, meatal stenosis, adhesions ~1–3%), benefits (reduced UTI risk in infancy, reduced HIV/HPV acquisition later, penile cancer reduction), and parental preference

— Absolute contraindications: hypospadias, chordee, ambiguous genitalia, bleeding diathesis, prematurity/instability, penoscrotal webbing — foreskin needed for repair

— Analgesia required: dorsal penile nerve block or ring block (preferred over EMLA alone); sucrose pacifier adjunct

— Performed >12–24 h of age after stable transition; verify vitamin K given

— Observe a feeding; lactation consult for difficulty

— Weight loss acceptable up to 7% (breastfed) by day 3, regain birth weight by 10–14 days

— Formula: iron-fortified, ~150 mL/kg/day by day 5–7

Step 3 management: any rectal temperature ≥38.0°C (100.4°F) in a neonate <28 days = full sepsis workup including LP and empirical IV ampicillin + gentamicin (± acyclovir if HSV concern) — no exceptions.

Circumcision (elective):

Cord care: dry cord care (no alcohol, no antibacterial); cord separates 1–3 weeks; concerning signs — erythema extending >5 mm onto abdominal wall (omphalitis — IV antibiotics, surgical eval), delayed separation >3 weeks (consider leukocyte adhesion deficiency)

Bathing: delay first bath ≥24 h (or until thermal stable) — reduces hypothermia, hypoglycemia, and preserves vernix antimicrobial properties; supports breastfeeding initiation rates

Predischarge feeding assessment:

Car seat tolerance screening: infants <37 weeks, LBW, or with hypotonia — observe in their car seat for 90–120 min monitoring SpO2, HR, RR before discharge.

Predischarge teaching topics: safe sleep (ABCs — Alone, Back, Crib; no bumpers/blankets/co-sleeping), tummy time when awake, no honey <12 months, no water <6 months, breastfeeding 8–12×/day, vitamin D 400 IU/day for breastfed infants, smoke-free environment, hand hygiene, signs of illness (fever ≥38°C rectal = ER).

Special Populations — Late Preterm and Small/Large for Gestational Age

— Risks: hypothermia (immature thermoregulation), hypoglycemia (low glycogen), feeding difficulty (poor suck-swallow coordination), hyperbilirubinemia (immature UGT1A1), respiratory distress/TTN/RDS, apnea, sepsis susceptibility

— Discharge criteria are stricter: minimum 48 h observation, documented successful feeding (formal feeding assessment by lactation), weight loss <7%, predischarge bilirubin with risk stratification, car seat tolerance screen, follow-up within 24–48 h of discharge

— Do not discharge before 48 h regardless of how well they appear

— Etiology: placental insufficiency, TORCH, chromosomal, maternal smoking/substance use, multiple gestation

— Risks: hypoglycemia (low glycogen + hyperinsulinism), hypothermia, polycythemia (hypoxia-driven EPO → hyperviscosity, jaundice), congenital infection

— Workup if symmetric SGA: TORCH titers, head circumference tracking, consider karyotype

— Glucose screening q3h × first 24 h

— Risks: birth trauma (clavicle fracture, brachial plexus injury — Erb's palsy with "waiter's tip"), shoulder dystocia, hypoglycemia (especially if IDM), polycythemia, cardiomyopathy in IDM

— Examine clavicles, brachial plexus function, screen glucose

— Macrosomia, hypoglycemia (fetal hyperinsulinism), hypocalcemia, hypomagnesemia, polycythemia, hyperbilirubinemia, transient hypertrophic cardiomyopathy (asymmetric septal hypertrophy, resolves), small left colon syndrome, increased risk of CHD (TGA, VSD), caudal regression, NTDs

— Glucose q3h × 12–24 h, echo if murmur/CHF signs

Key distinction: symmetric SGA (head and body equally small) suggests early insult (TORCH, genetic); asymmetric SGA (head-sparing) suggests late placental insufficiency.

Late preterm infants (34 0/7–36 6/7 weeks): appear deceptively term but have 2–3× higher morbidity and readmission than term infants.

Small for gestational age (SGA, <10th percentile):

Large for gestational age (LGA, >90th percentile):

Infant of diabetic mother (IDM):

Special Populations — Substance Exposure, Maternal Infection, and Multiples

— Onset: opioids 24–72 h (longer for methadone/buprenorphine, up to 5–7 d), SSRIs 1–2 d, alcohol 12 h, benzodiazepines days–weeks

— Symptoms: tremors, irritability, hypertonia, high-pitched cry, poor feeding, diarrhea, sneezing, yawning, autonomic instability

— Scoring: Finnegan or Eat-Sleep-Console (ESC) approach (ESC reduces pharmacotherapy and LOS — emerging standard)

— Nonpharmacologic first: low stimulation, swaddling, rooming-in with mother, breastfeeding (allowed if on methadone/buprenorphine and not using illicit drugs/HIV-negative)

— Pharmacologic if uncontrolled: morphine or methadone first-line; clonidine or phenobarbital adjuncts

— Minimum observation: 72 h for short-acting opioids, 4–7 d for methadone

Board pearl: mothers on methadone or buprenorphine for OUD should be encouraged to breastfeed — minimal drug transfer and breastfeeding reduces NAS severity.

Neonatal abstinence syndrome (NAS) / neonatal opioid withdrawal syndrome (NOWS):

Maternal HBV+: HBV vaccine + HBIG within 12 h; breastfeeding allowed

Maternal HIV+: ART prophylaxis as above; avoid breastfeeding in US; screen with HIV DNA/RNA PCR at 14–21 d, 1–2 mo, 4–6 mo

Maternal HCV+: test infant with HCV RNA at 2–6 mo or anti-HCV at ≥18 mo; breastfeeding allowed unless cracked/bleeding nipples

Maternal active genital HSV: cesarean if active lesions; obtain surface/blood/CSF HSV PCR at 24 h; empirical IV acyclovir 60 mg/kg/d if primary maternal infection near term

Maternal syphilis: evaluate infant if mother inadequately treated, treated <4 weeks before delivery, or titers not declining 4-fold; full eval = RPR (infant titer ≥4× mother = congenital), LP, long bone x-rays, CBC; treat with IV penicillin G 10 days

Maternal GBS+ with inadequate prophylaxis + symptomatic infant or risk factors: blood culture, CBC, empirical antibiotics

Twins/multiples: higher risk of prematurity, TTTS sequelae, IUGR discordance — individualize discharge

Complications and Adverse Outcomes

Step 3 management: for an infant returning at day 5 with weight loss 12%, lethargy, hypernatremia → admit, IV fluids (cautious — correct Na slowly <0.5 mEq/L/h to avoid cerebral edema), reestablish feeding with lactation support, recheck bilirubin.

Acute bilirubin encephalopathy (kernicterus): preventable disaster — bilirubin-induced neurologic dysfunction (BIND) progresses from lethargy/poor feeding → hypertonia/retrocollis/opisthotonus/high-pitched cry → seizures, apnea, death; survivors have chronic kernicterus (athetoid CP, hearing loss, gaze palsy, dental dysplasia). Risk highest with TSB >25–30 mg/dL, especially with hemolysis or prematurity.

Hypoxic-ischemic encephalopathy (HIE): moderate-severe HIE in term/late preterm → therapeutic hypothermia within 6 h reduces death/disability; long-term sequelae include CP, intellectual disability, epilepsy.

Early-onset sepsis (EOS, <72 h): GBS, E. coli most common; mortality 5–10% term, 20% preterm; meningitis in ~25%.

Late-onset sepsis (LOS, 7–90 d): community-acquired (E. coli, GBS, Listeria) vs nosocomial (CoNS, Staph aureus, gram-negatives, Candida in NICU).

Hypoglycemic brain injury: persistent symptomatic hypoglycemia → occipital/parietal white matter injury → visual impairment, epilepsy.

Brachial plexus injury: Erb-Duchenne (C5–C6, waiter's tip, 90% spontaneous recovery by 3 mo); Klumpke (C8–T1, claw hand, Horner syndrome); refer to brachial plexus clinic if no recovery by 3–6 weeks.

Subgaleal hemorrhage: vacuum-assisted delivery risk; can sequester entire blood volume; boggy fluctuant scalp crossing sutures, expanding head circumference, tachycardia, pallor — emergency.

Readmission causes (first 2 weeks): hyperbilirubinemia (#1), dehydration/feeding failure, jaundice with weight loss >10%, sepsis evaluations, respiratory issues.

Inadvertent omissions: missed CCHD detection → ductal-dependent lesion collapse at home (~day 3–14 when PDA closes), missed congenital hypothyroidism → cretinism, missed PKU → intellectual disability.

When to Escalate Care — NICU, Consult, and Transfer

— Gestational age <35 weeks or birth weight <2000 g (institution-dependent)

— Persistent respiratory distress, need for CPAP/oxygen >2–4 h, intubation

— Persistent hypoglycemia despite enteral feeds or requiring IV dextrose >8 mg/kg/min

— Suspected sepsis requiring antibiotics with instability

— Seizures, abnormal neuro exam, suspected HIE for cooling

— Major congenital anomaly requiring surgery (CDH, gastroschisis, TEF, myelomeningocele, ductal-dependent CHD)

— Hyperbilirubinemia requiring exchange transfusion

— Persistent pulmonary hypertension of newborn (PPHN), meconium aspiration with hypoxemia

— Cardiology: failed CCHD screen, persistent murmur, cyanosis, abnormal pulses, prenatally diagnosed CHD

— Neurology: seizures, abnormal tone, encephalopathy

— Genetics: dysmorphic features, multiple anomalies, abnormal NBS

— Surgery: abdominal wall defects, bowel obstruction signs, imperforate anus, sacrococcygeal teratoma

— Endocrinology: persistent hypoglycemia, abnormal NBS (CAH, hypothyroidism), ambiguous genitalia

— Hematology: severe anemia, thrombocytopenia, prolonged bleeding

— Ophthalmology: absent red reflex, ROP screening if <30 weeks or <1500 g

— Lactation: all breastfeeding dyads with difficulty, weight loss >7%

CCS pearl: in a CCS case with a newborn showing lower extremity cyanosis worse than upper, suspect ductal-dependent systemic circulation (coarctation, HLHS) → start PGE1 0.05 mcg/kg/min, order echo, consult pediatric cardiology, transfer to Level IV — do this before the full workup completes.

NICU admission criteria (any of):

Subspecialty consult triggers:

Transfer to higher-level center: Level I (basic, well newborn) → Level II (special care) → Level III (NICU) → Level IV (regional, ECMO, cardiac surgery); arrange via dedicated neonatal transport team; stabilize ABCs, glucose, temperature first.

Key Differentials — Causes of Respiratory Distress in the Newborn

— Risk: cesarean without labor, late preterm, maternal diabetes/asthma

— Mechanism: delayed clearance of fetal lung fluid

— Onset within 2 h, peaks 6–24 h, resolves <72 h

— CXR: hyperinflation, perihilar streaking, fluid in fissures

— Management: supportive O2, NPO if RR >80, IV fluids

— Surfactant deficiency, primarily <34 weeks, IDM

— Onset within minutes-hours, worsens 48–72 h

— CXR: low lung volumes, diffuse reticulogranular ("ground glass"), air bronchograms

— Management: CPAP, surfactant (INSURE or LISA), antenatal corticosteroids prevention

— Term/post-term with meconium-stained fluid; non-vigorous → consider intubation/suction

— CXR: patchy infiltrates, hyperinflation, pneumothorax risk

— Complications: PPHN — manage with iNO, ECMO if refractory

Key distinction: TTN vs RDS — TTN occurs in term/late preterm after cesarean, resolves in <72 h with O2 alone; RDS occurs in earlier preterm, worsens before improving, needs surfactant. CXR is the differentiator (wet lung vs ground glass).

Transient tachypnea of newborn (TTN):

Respiratory distress syndrome (RDS):

Meconium aspiration syndrome (MAS):

Pneumonia/sepsis: GBS, E. coli, Listeria; CXR mimics RDS; antibiotics

Pneumothorax: sudden distress, asymmetric breath sounds, transilluminate; needle decompression then chest tube if tension

Persistent pulmonary hypertension of newborn (PPHN): R→L shunting through PDA/PFO; preductal-postductal SpO2 difference >10%; iNO, sildenafil, ECMO

Congenital diaphragmatic hernia (CDH): scaphoid abdomen, bowel sounds in chest, mediastinal shift; do NOT bag-mask ventilate — intubate immediately, NG decompression

Choanal atresia: cyanosis at rest relieved by crying; cannot pass NG catheter; CHARGE association

Key Differentials — Non-Respiratory Causes of Distress and "Sick Newborn"

— Cyanotic (5 T's): Truncus, TGA (transposition), Tricuspid atresia, Tetralogy of Fallot, TAPVR — present with cyanosis, often murmur, fail CCHD screen

— Left-sided obstructive: HLHS, critical AS, coarctation, interrupted aortic arch — present at day 3–14 with cardiogenic shock as PDA closes; weak/absent femoral pulses, differential cyanosis

— Management: PGE1 infusion to maintain ductal patency; echo; transfer

Board pearl: a previously well newborn who presents at 1–2 weeks with shock and ambiguous genitalia (or apparent male without palpable testes) — think CAH salt-wasting crisis; check electrolytes, give stress-dose hydrocortisone empirically.

Ductal-dependent congenital heart disease:

Sepsis/meningitis: lethargy, poor feeding, temperature instability (hypo more common than hyper in neonates), apnea, irritability, bulging fontanelle — full workup, empiric ampicillin + gentamicin ± acyclovir for HSV

Inborn errors of metabolism: present after feeds initiated (day 2–7), well at birth then deterioration — lethargy, vomiting, hypotonia, seizures, distinctive odors; check ammonia, lactate, glucose, ketones, acylcarnitine; treat by stopping protein, giving glucose, dialysis if severe hyperammonemia

Congenital adrenal hyperplasia (21-hydroxylase deficiency): salt-wasting crisis at 1–2 weeks — vomiting, dehydration, hyperkalemia, hyponatremia, ambiguous genitalia in females; check 17-OHP (on NBS); hydrocortisone, fludrocortisone, saline

Bowel obstruction: bilious emesis = surgical emergency until proven otherwise — malrotation/volvulus (urgent UGI), duodenal atresia (double bubble, Down syndrome), jejunoileal atresia, meconium ileus (CF), Hirschsprung (delayed meconium, contrast enema), imperforate anus

Nonaccidental trauma (rare in newborns): retinal hemorrhages, subdural — mandatory reporting

Hypoglycemia, hypocalcemia, hypomagnesemia: all cause jitteriness/seizures

Hypothyroidism (congenital): lethargy, large fontanelles, prolonged jaundice, hypotonia, umbilical hernia, coarse facies — detected on NBS, treat with levothyroxine within 2 weeks to prevent intellectual disability

Secondary Prevention, Discharge Medications, and Long-Term Plan

— Vitamin D 400 IU PO daily for all breastfed and partially breastfed infants from first days of life; formula-fed need supplementation if taking <1 L/day

— Iron supplementation: exclusively breastfed term infants need 1 mg/kg/d iron from 4 months until iron-rich complementary foods; preterm infants 2 mg/kg/d starting at 1 month

— Fluoride: not before 6 months; consider after 6 months if water fluoride <0.3 ppm

— Birth: HBV #1

— 1–2 months: HBV #2

— 2 months: DTaP, IPV, Hib, PCV15/20, RV, HBV (if combo)

— Influenza annually from 6 months

— RSV prevention: nirsevimab (monoclonal) for all infants <8 months entering first RSV season, OR maternal RSVpreF vaccine 32–36 weeks gestation

— Safe sleep: Back to sleep, firm flat surface, room-sharing (not bed-sharing) for first 6 months, no soft bedding/bumpers/positioners, pacifier at sleep onset, avoid overheating, no smoke exposure

— Feeding: exclusive breastfeeding 6 months, continue with complementary foods to 2 years per AAP/WHO; formula until 12 months then whole cow's milk

— Injury prevention: rear-facing car seat until ≥2 years; never leave on elevated surface; bath safety; water heater <120°F

— Skin: mild detergents, avoid sun exposure, no sunscreen <6 months

— Crying ("PURPLE crying"): counsel about shaken baby syndrome prevention

Step 3 management: every newborn discharge note should specify (1) 48–72 h pediatric follow-up appointment, (2) PCP/medical home identified, (3) return precautions (fever ≥38°C rectal, poor feeding, lethargy, jaundice spreading to legs, decreased wet diapers, respiratory distress), (4) car seat, (5) safe sleep counseled.

Discharge medication list (well newborn):

Immunization schedule (catch-up if delayed):

Anticipatory guidance topics:

Newborn metabolic screen follow-up: PCP must confirm receipt of results within 2 weeks; abnormal results trigger urgent referral

Follow-Up, Monitoring, and Family Counseling

— Weight: acceptable loss up to 7% breastfed, 5% formula-fed; >10% loss requires evaluation; expect regain birth weight by 10–14 days

— Feeding: 8–12 breastfeeds or 6–8 formula feeds per 24 h; ≥6 wet diapers and ≥3–4 yellow seedy stools after day 4

— Jaundice: visual cephalocaudal assessment; transcutaneous or serum bilirubin if any concern, especially in infants with risk factors or early discharge

— Exam: vitals, hydration, fontanelles, jaundice, umbilicus, hip exam, circumcision site, neuro tone

— Review NBS results

— Confirm regained birth weight

— Reassess feeding, bilirubin trend

— Repeat NBS if first was before 24 h

— Anticipatory guidance on development

Key distinction: infant with jaundice extending below the knees at 5 days old — always check serum bilirubin and plot on the AAP hour-of-life nomogram; visual estimation alone is unreliable, especially in darker-skinned infants.

First office visit (48–72 h after discharge for healthy term; 24–48 h for late preterm or risk factors):

Second visit at 2 weeks:

Well-child schedule: 1, 2, 4, 6, 9, 12, 15, 18, 24, 30 months, then annually — Bright Futures schedule

Developmental surveillance every visit; formal screening (ASQ, M-CHAT) at 9, 18, 24/30 months

Hearing: confirm 1-3-6 timeline (screen by 1 mo, diagnose by 3 mo, EI by 6 mo)

Vision: red reflex every visit; formal acuity by age 3

Lead screening: 12 and 24 months (Medicaid universal; risk-based for others)

Anemia screening (Hgb) at 12 months

Dental home by 12 months; first dental visit when first tooth erupts or by 1 year

Postpartum maternal screening: mood (Edinburgh Postnatal Depression Scale) at each well-child visit through 6 months — Step 3 emphasizes treating the dyad

Ethical, Legal, and Patient Safety Considerations

— Parents may refuse vitamin K, hep B, eye prophylaxis, and circumcision but must be counseled; document risk discussion; some states require additional acknowledgement forms for vitamin K refusal

— Refusal of newborn metabolic screen: most states allow only religious exemption; document carefully

— Refusal of life-saving treatment (e.g., transfusion for Jehovah's Witness parents): seek emergency court order; physicians can override parental refusal for clear medical necessity in a minor

— Suspected child abuse/neglect: retinal hemorrhages, unexplained fractures, suspicious bruising in non-mobile infant → report to CPS — this is mandatory and overrides parental confidentiality

— Positive maternal toxicology / substance-exposed newborn: reporting requirements vary by state (CAPTA requires "Plan of Safe Care," not necessarily CPS referral); know your state law

— Newborn metabolic screen results: state lab reports directly to PCP; PCP responsible for ensuring follow-up

— Hospital-to-home handoff is the single highest-risk transition for newborns — confirmed PCP appointment, accurate medication list, NBS pending result tracking, return precautions in family's language and literacy level

— Use teach-back method for safe sleep, feeding, fever instructions

Board pearl: in a newborn with retinal hemorrhages plus subdural hematoma, suspect abusive head trauma — you must file a CPS report even if explanation seems plausible; failure to report carries criminal liability for mandated reporters.

Informed consent and refusal:

Mandatory reporting:

Safe Haven laws: in all 50 states, a parent may relinquish a newborn (typically <30 days, some states up to 1 year) at designated locations (hospital, fire station) without legal repercussion — counsel if parents express inability to care

Birth certificate, Social Security, and identification: verified before discharge; ID bands match mother-infant

Transition of care safety:

Health equity: Black infants have 2× the mortality of white infants in the US; visual jaundice assessment is unreliable in dark skin — use TcB/TSB universally; ensure language-concordant care

Genetic counseling: abnormal NBS results require sensitive disclosure and timely subspecialist referral

High-Yield Associations and Rapid-Fire Clinical Facts

Key distinction: physiologic peripheral cyanosis (acrocyanosis) resolves within 24–48 h; central cyanosis is always pathologic at any age.

APGAR components: Appearance, Pulse, Grimace, Activity, Respirations — each 0–2, max 10

Golden minute = first 60 seconds: initiate resuscitation if needed within this window

Fetal Hb to adult Hb switch: complete by 6 months; physiologic nadir Hgb 9–11 at 2–3 months

Physiologic jaundice: appears after 24 h, peaks day 3–5 (term), resolves by 1–2 weeks; pathologic = <24 h, rate >0.2 mg/dL/h, total >17, conjugated >1, persists >2 weeks

Breast milk jaundice (peaks 2 weeks, can persist 12 weeks) vs breastfeeding failure jaundice (first week, dehydration)

CCHD screen positive criteria: SpO2 <90% anywhere, <95% in RH AND foot on 3 measurements, OR >3% difference on 3 measurements

Hep B + HBIG within 12 h if mother HBsAg positive

Vitamin K IM 1 mg prevents VKDB; oral inadequate

Erythromycin eye ointment prevents gonococcal not chlamydial conjunctivitis

Hearing 1-3-6 rule: screen 1 mo, diagnose 3 mo, EI 6 mo

Newborn weight loss: up to 7% normal; regain by 2 weeks

Rectal temp ≥38°C in neonate <28 days = full sepsis workup with LP, empiric ampicillin + gentamicin

Bilious emesis = malrotation until proven otherwise

No meconium by 48 h = Hirschsprung, CF, imperforate anus

Single umbilical artery = associated with renal anomalies (image if other findings)

Caput crosses sutures; cephalohematoma does not; subgaleal crosses and is dangerous

Erb palsy = C5–C6, waiter's tip

Klumpke palsy = C8–T1, claw hand + Horner

Edwards (T18) = clenched fists, rocker-bottom feet, micrognathia

Patau (T13) = holoprosencephaly, cleft lip, polydactyly

Down (T21) = single palmar crease, hypotonia, epicanthal folds, AV canal defect — screen with echo, TSH, CBC, ophth

Vitamin D 400 IU/day for breastfed infants

Iron 1 mg/kg/d in breastfed infants starting at 4 months

Nirsevimab for RSV prevention in infants <8 mo

Safe sleep ABCs: Alone, Back, Crib

Board Question Stem Patterns

Step 3 management pattern: the "right answer" usually integrates risk stratification + timely outpatient follow-up + family education rather than aggressive intervention — Step 3 rewards ambulatory thinking.

"Newborn at 36 hours with TSB 14, gestational age 38 weeks, blood type A+, mother O+, no risk factors..." → plot on AAP 2022 nomogram, determine zone, decide phototherapy vs follow-up at 24 h with repeat TSB

"38-week newborn at 12 hours of life with HR 180, RR 70, jittery, mother had GDM..." → check glucose (likely hypoglycemia), feed/IV dextrose

"Newborn at 18 hours becomes lethargic and cyanotic, SpO2 75% in RH and 76% in foot, no improvement with O2..." → cyanotic CHD (likely TGA), start PGE1, echo, hyperoxia test

"7-day-old presents lethargic, vomiting, Na 125, K 6.5, female with clitoromegaly..." → CAH salt-wasting crisis, hydrocortisone + saline

"Newborn passes hearing screen but mother had a febrile illness with rash in first trimester..." → congenital CMV/rubella concern; CMV PCR within 3 weeks, audiology follow-up

"4-day-old breastfed infant, 12% weight loss, jaundiced to thighs, Na 152..." → lactation failure/breastfeeding jaundice + hypernatremic dehydration; admit, slow correction, lactation support, supplement

"Newborn with bilious vomiting at 24 hours..." → urgent UGI for malrotation/volvulus

"Mother HBsAg positive, infant born at 39 weeks..." → HBV vaccine + HBIG within 12 h; test infant at 9–12 months

"Infant of opioid-dependent mother on methadone, day 3 with tremors, irritability, poor feeding..." → NAS; ESC approach, rooming-in, breastfeeding encouraged, morphine if needed

"Newborn fails CCHD screen with SpO2 92% RH, 87% foot..." → echo immediately, suspect coarctation/HLHS, PGE1 if confirmed

"4-week-old breastfed infant with persistent jaundice, acholic stools, dark urine, conjugated bili 4..." → biliary atresia workup (HIDA, U/S), urgent peds GI/surgery referral for Kasai before 60 days

"Late preterm infant (35 weeks) ready for discharge at 36 hours of life..." → not yet ready — needs minimum 48 h, formal feeding assessment, predischarge bilirubin, car seat test, 24–48 h follow-up

"Newborn with absent red reflex on left eye..." → urgent ophthalmology for retinoblastoma/congenital cataract

One-Line Recap

The safe discharge of a newborn is the deliberate convergence of stable transitional physiology, universal screening (metabolic, CCHD, hearing, bilirubin), feeding adequacy, and a guaranteed early follow-up visit — failure of any one element is the most common preventable cause of neonatal readmission and harm.

Board pearl: when in doubt on Step 3, the answer for a "well newborn" is almost always predischarge bilirubin measurement plotted on the AAP nomogram + scheduled 48-hour pediatric follow-up + safe-sleep education — this triad prevents the dominant causes of neonatal readmission and morbidity.

Resuscitation: NRP "golden minute" — warm, dry, stimulate, position, PPV with room air (term) for HR <100; chest compressions 3:1 if HR <60 despite effective PPV; epinephrine if persistent.

Universal predischarge bundle: vitamin K IM, erythromycin eye, HBV vaccine (+ HBIG if maternal HBsAg+), newborn metabolic screen at ≥24 h, CCHD pulse ox at ≥24 h, hearing screen, predischarge bilirubin on the Bhutani/AAP nomogram, hip exam, feeding assessment, car seat test if late preterm.

Discharge readiness: ≥24–48 h observation (48 h late preterm or post-cesarean), stable vitals in open crib, successful feeds ×2, void + stool, exam normal, weight loss <7%, identified PCP, follow-up scheduled in 48–72 h (24–48 h if late preterm or jaundice risk), safe-sleep counseling, return precautions.

Red flags requiring escalation: rectal temp ≥38°C <28 days (full sepsis workup), bilious emesis (malrotation), failed CCHD screen (PGE1 + echo), conjugated hyperbilirubinemia (biliary atresia by 60 days), weight loss >10% with hypernatremia, jaundice <24 h, absent red reflex, lethargy, ambiguous genitalia with vomiting (CAH).