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Pediatrics & Neonatology: Comprehensive Topic Guide

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1. Respiratory (Pediatric)

Key Conditions

• Most common cause of respiratory distress in preterm neonates (<37 weeks), especially <34 weeks
• Pathophysiology: surfactant deficiency → alveolar collapse → ↑ work of breathing, hypoxemia, hypercarbia
• Clinical features: tachypnea, grunting, nasal flaring, subcostal/intercostal retractions, cyanosis within 6 hours of birth
• CXR: ground-glass opacity, air bronchograms, "white-out" in severe cases
• Management:
  • Antenatal corticosteroids (betamethasone 12 mg IM × 2 doses, 24h apart) if 24–34 weeks gestation
  • Exogenous surfactant (beractant, poractant alfa) — intratracheal
  • CPAP or mechanical ventilation
  • Oxygen — target SpO₂ 91–95% in preterms

• Most common respiratory disorder in term neonates
• Caused by delayed resorption of fetal lung fluid (especially after C-section)
• Self-limiting within 12–72 hours
• CXR: wet silhouette, perihilar streaking, fluid in fissures

• Seen in post-term or stressed term infants
• Pathophysiology: meconium in amniotic fluid → aspiration → ball-valve obstruction, pneumonitis, pulmonary hypertension
• Management: suctioning, surfactant, inhaled NO for pulmonary hypertension, ECMO in refractory cases

• Most common lower respiratory tract infection in infants <2 years
• Most common cause: RSV (Respiratory Syncytial Virus)
• Features: rhinorrhea → cough → wheeze/crackles → respiratory distress
• Management: supportive — oxygen, hydration, high-flow nasal cannula
• Palivizumab: RSV prophylaxis for high-risk infants (preterms <29 weeks, CLD, congenital heart disease)

• Neonatal: GBS, E. coli, Listeria (early-onset); Staph aureus, Klebsiella (late-onset)
• Infants 1–3 months: Chlamydia trachomatis (staccato cough, no fever, eosinophilia)
• Toddlers/preschool: viral (RSV, parainfluenza, rhinovirus)
• School age+: Mycoplasma pneumoniae ("walking pneumonia")

• Autosomal recessive, CFTR mutation (ΔF508 most common)
• Features: recurrent pulmonary infections, pancreatic exocrine insufficiency, failure to thrive, meconium ileus in neonates, salty sweat
• Diagnosis: newborn screening (IRT), sweat chloride test >60 mmol/L
• Management: physiotherapy, CFTR modulators (ivacaftor, elexacaftor-tezacaftor-ivacaftor), enzyme replacement, antibiotics

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2. Nutrition (Pediatric)

Caloric Requirements

Macronutrients

• Protein: 3–4 g/kg/day (preterm), 1.5–2 g/kg/day (term infant)
• Fat: 50% of calories in breast milk; essential fatty acids (DHA, ARA) critical for brain development
• Carbohydrates: lactose primary source in infants

Routes of Feeding

• Enteral nutrition preferred whenever gut is functional
• Parenteral nutrition (PN): for preterm or ill neonates unable to tolerate enteral feeds
  • Provides glucose, amino acids, lipid emulsions (Intralipid), electrolytes, trace elements
  • Complications: catheter-related sepsis, cholestasis, hyperglycemia

Malnutrition

• Protein-Energy Malnutrition (PEM):
  • Kwashiorkor: protein deficiency, edema, hair changes (flag sign), dermatitis, preserved fat stores, fatty liver
  • Marasmus: total caloric deficiency, severe wasting, no edema, very low weight, alert facies
• WHO management: RUTF (Ready-to-Use Therapeutic Food), 10 steps of nutritional rehabilitation

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3. Micronutrients

Vitamin A

• Deficiency: xerophthalmia (night blindness → Bitot spots → corneal ulceration → keratomalacia), increased susceptibility to infections
• Supplementation: given at 6, 12, and 18 months in deficiency-endemic areas
• Measles complication: high-dose Vitamin A supplementation (200,000 IU) reduces morbidity/mortality

Vitamin D

• Deficiency → Rickets (nutritional): bowed legs, rachitic rosary, widened wrists, Harrison's groove, craniotabes
• Diagnosis: low 25-OH Vitamin D, low Ca²⁺/PO₄, elevated ALP and PTH
• Treatment: Vitamin D₃ 2,000–4,000 IU/day + calcium supplementation
• All breastfed infants: 400 IU/day Vitamin D supplement from birth

Vitamin C

• Deficiency → Scurvy: perifollicular hemorrhages, corkscrew hairs, bleeding gums, subperiosteal hemorrhage, Frankel lines on X-ray

Vitamin K

• Deficiency → Hemorrhagic Disease of Newborn (Vitamin K Deficiency Bleeding, VKDB)
  • Early (0–24h): maternal drugs (anticonvulsants, warfarin)
  • Classic (2–7 days): breastfed, no prophylaxis
  • Late (2–12 weeks): fat malabsorption, cholestasis
• Prevention: Vitamin K 1 mg IM at birth (0.5 mg if <1,500 g)

Iron (Fe)

• See topic 11 below

Iodine

• Deficiency: congenital hypothyroidism, cretinism (intellectual disability, goiter, stunted growth, deafness)
• Universal salt iodization is primary prevention strategy

Zinc

• Deficiency: impaired wound healing, diarrhea, alopecia, acrodermatitis enteropathica (autosomal recessive, failure to absorb zinc)
• Critical for immune function and growth

Folate

• Deficiency in pregnancy → neural tube defects (spina bifida, anencephaly)
• Supplementation: 400–800 µg/day periconceptionally

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4. NICU (Neonatal Intensive Care Unit)

Admission Criteria

• Prematurity <34 weeks, birth weight <1,500 g (VLBW) or <1,000 g (ELBW)
• Respiratory distress, apnea of prematurity
• Neonatal sepsis, meconium aspiration, birth asphyxia
• Surgical conditions (NEC, CDH, esophageal atresia)

Key NICU Problems

• Cessation of breathing >20 seconds or shorter with bradycardia/desaturation
• Types: central (no respiratory effort), obstructive (effort but no airflow), mixed (most common)
• Management: methylxanthines (caffeine citrate — drug of choice), CPAP, tactile stimulation
• Caffeine: reduces need for mechanical ventilation, associated with improved neurodevelopmental outcomes

• Common in VLBW/ELBW preterms
• Grading (Papile classification):
  • Grade I: germinal matrix only
  • Grade II: IVH without ventricular dilation
  • Grade III: IVH with ventricular dilation
  • Grade IV: periventricular hemorrhagic infarction (worst prognosis)
• Screening: cranial ultrasound day 3–5 and day 7–10
• Prevention: antenatal steroids, Vitamin K, indomethacin (prophylactic)

• Most common GI surgical emergency in neonates
• Risk factors: prematurity, formula feeding, hypoxia, polycythemia
• Bell's staging:
  • Stage I: suspected (clinical signs, normal/nonspecific X-ray)
  • Stage II: confirmed (pneumatosis intestinalis on X-ray)
  • Stage III: advanced (perforation — pneumoperitoneum)
• Management: NPO, NG decompression, broad-spectrum antibiotics, surgical resection for perforation/necrosis
• Prevention: breast milk, probiotic supplementation

• Physiological: starts day 2–3, peaks day 4–5, resolves by day 10 (term) or day 14 (preterm)
• Pathological: starts <24 hours, rises >5 mg/dL/day, direct bilirubin >2 mg/dL
• Causes: hemolytic (ABO/Rh incompatibility, G6PD), sepsis, metabolic
• Management: phototherapy (AAP curves by gestational age/age in hours), exchange transfusion

• Abnormal retinal vascularization in preterms (<32 weeks, <1,500 g)
• Zonal classification (I, II, III) and staging (1–5)
• Plus disease: vascular dilation + tortuosity
• Screening: dilated fundus exam at 4–6 weeks of age
• Treatment: laser photocoagulation, anti-VEGF (bevacizumab)

• Neonates: poikilothermic, high surface area:mass ratio → rapid heat loss
• Methods of heat loss: radiation, convection, conduction, evaporation
• Management: radiant warmer, incubator, skin-to-skin (kangaroo care)
• Therapeutic hypothermia: for HIE (hypoxic-ischemic encephalopathy) ≥36 weeks, initiated within 6 hours of birth, target 33–34°C for 72 hours

• Threshold: blood glucose <47 mg/dL (symptomatic) or <40 mg/dL (neonatal)
• Risk groups: IDM, SGA, preterm, macrosomic infants
• Symptoms: jitteriness, seizures, apnea, hypotonia, lethargy
• Management: early enteral feeding, IV dextrose (D10W 2 mL/kg bolus → infusion)

• Early-onset (<72h): GBS, E. coli, Listeria — acquire intrapartum
• Late-onset (>72h): coagulase-negative Staph, Staph aureus, Gram-negative rods
• Workup: CBC, CRP, blood culture, LP (if stable), urine culture
• Empirical treatment: ampicillin + gentamicin (early); vancomycin + aminoglycoside (late)

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5. Growth and Development

Physical Growth

• Birth weight: average 3.0–3.5 kg
• Physiological weight loss 7–10% in first week (regained by day 10–14)
• Doubles by 5 months, triples by 12 months
• 4–6 years: +2 kg/year

• Birth: 50 cm → 75 cm by 12 months → 100 cm by 4 years
• Pubertal growth spurt: girls ~10–11 years, boys ~12–13 years

• Birth: 33–35 cm → +12 cm in first year (half of postnatal growth)
• Anterior fontanelle closes: 9–18 months
• Posterior fontanelle closes: 6–8 weeks

Developmental Milestones

Denver Developmental Screening Test (DDST)

• Screens personal-social, fine motor-adaptive, language, gross motor
• Not diagnostic — identifies children needing further evaluation

Red Flags (Developmental)

• No social smile by 3 months
• No head control by 4 months
• Not sitting unsupported by 9 months
• No words by 16 months, no 2-word phrases by 24 months
• Any regression of milestones at any age

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6. Immunization (Pediatric)

EPI Schedule (India / WHO-based)

Key Points

• BCG: given at birth, protects against disseminated TB, tuberculosis meningitis; Mantoux test may be positive after BCG
• OPV vs IPV: OPV — live attenuated (oral, cheap, herd immunity, risk of VAPP); IPV — inactivated (injectable, no VAPP risk, preferred in India now)
• Cold chain: vaccines stored at 2–8°C (freeze-sensitive: DTP, Hep B, Hib, PCV; freeze-tolerant: OPV, MMR, BCG)
• Contraindications: live vaccines contraindicated in immunocompromised (except HIV with CD4 >25%); MMR contraindicated in egg allergy (anaphylaxis) — actually safe in egg allergy; contraindicated in pregnancy
• Vaccine adverse events: BCG adenitis, febrile seizures post-MMR (day 7–12), intussusception risk post-rotavirus, anaphylaxis

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7. Complementary Feeding

Definition

WHO Recommendations

• Exclusive breastfeeding for first 6 months
• Complementary feeding introduced at exactly 6 months (not before 4 months)
• Continue breastfeeding up to 2 years or beyond

IYCF Principles (Infant and Young Child Feeding)

• Timely: start at 6 months
• Adequate: sufficient in quantity, quality, nutrient density
• Safe: hygienic preparation, safe storage
• Appropriately fed: responsive feeding, appropriate texture by age

Feeding Progression

What to Introduce

• Staples (rice, wheat, maize), legumes, vegetables, fruits, animal source foods (meat, egg, fish, dairy)
• Iron-rich foods early (meat, fortified cereals) — critical given iron stores deplete after 6 months
• No added salt, sugar, honey (honey: risk of infant botulism <1 year)
• No cow's milk as main drink before 12 months (may be used in cooking)

Common Mistakes

• Early introduction (<4 months): ↑ risk of allergy, obesity, celiac disease
• Late introduction (>6 months): ↑ risk of iron deficiency, stunting
• Low nutrient density foods: watery porridges (energy-poor)
• Improper hygiene: diarrheal disease

Allergen Introduction

• Current evidence supports early introduction of allergenic foods (peanuts, eggs) at 6 months to reduce sensitization risk (LEAP trial evidence)
• Do not delay introduction of potentially allergenic foods beyond 12 months

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8. Breastfeeding and Lactation

Benefits of Breastfeeding

• Protective against: otitis media, respiratory infections, UTI, NEC, SIDS, diarrhea
• Reduces risk of: obesity, type 1 & 2 diabetes, leukemia, asthma, eczema
• Optimal cognitive development (DHA, human milk oligosaccharides, growth factors)
• Passive immunity via sIgA, lactoferrin, lysozyme, macrophages, lymphocytes

• Reduces risk of: breast cancer, ovarian cancer, type 2 diabetes, postpartum hemorrhage (via oxytocin)
• Lactational amenorrhea method (LAM): family planning if exclusive, amenorrheic, <6 months → 98% effective

Composition of Breast Milk

• Foremilk: watery, high lactose — quenches thirst
• Hindmilk: fat-rich — provides calories; infant must empty breast to receive hindmilk

Lactation Physiology

• Prolactin: milk production (anterior pituitary); peaks with infant suckling
• Oxytocin: milk ejection reflex (let-down); released with suckling, skin-to-skin, hearing cry
• Supply = demand: frequent, effective suckling establishes milk supply

Latch Assessment (LATCH Score)

• Latch, Audible swallowing, Type of nipple, Comfort, Hold — scored 0–2 each

Contraindications to Breastfeeding

• Absolute: maternal HIV in resource-rich settings, infant galactosemia, maternal active TB (untreated <2 weeks), maternal HTLV-1/2, maternal herpes simplex lesion on breast
• Relative/temporary: maternal chemotherapy, certain medications (radioactive isotopes, antineoplastics)
• Note: CMV in mature breast milk is low-risk for term infants; concern only in VLBW preterms

Common Breastfeeding Problems

• Engorgement: frequent feeding, warm compress, proper latch
• Sore nipples: improper latch, Raynaud's phenomenon, candidal infection
• Mastitis: S. aureus most common; continue breastfeeding + antibiotics (dicloxacillin)
• Insufficient milk: reassurance, frequent feeding, ensuring effective latch; domperidone/metoclopramide (galactagogues) — use with caution
• Jaundice: breast milk jaundice (indirect, starts day 7, resolves with continued feeding) vs. breastfeeding failure jaundice (early, improper latch → inadequate intake → dehydration)

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9. Cerebral Palsy (CP)

Definition

Classification

• Spastic (most common, ~85%): upper motor neuron lesion, ↑ tone, brisk reflexes, scissor gait
  • Spastic diplegia: predominantly lower limbs (preterm association)
  • Spastic hemiplegia: one side (term, periventricular leukomalacia or MCA stroke)
  • Spastic quadriplegia: all 4 limbs (most severe; associated with intellectual disability, seizures)
• Dyskinetic/Athetoid: basal ganglia lesion; choreoathetosis; kernicterus association
• Ataxic: cerebellar; least common; wide-based gait, hypotonia
• Mixed: most common in practice

Etiology

• Prenatal (most common ~75%): genetic, congenital brain malformations, TORCH infections, stroke in utero
• Perinatal: HIE, birth asphyxia, prematurity-related (IVH, PVL), kernicterus
• Postnatal: meningitis, head trauma, encephalitis (<2–3 years)

Associated Conditions (CAMPS mnemonic — Communication, Associated disorders, Motor, Perception, Seizures)

• Epilepsy (30–50%), intellectual disability, visual impairment, hearing loss, speech/language disorders, feeding difficulties, scoliosis, hip dysplasia, pain

Diagnosis

• Clinical: history + neurological exam + developmental assessment
• MRI brain: most useful (PVL, cortical malformations, basal ganglia lesions) — recommended in all cases
• Cranial ultrasound: IVH, PVL in preterm
• EEG if seizures suspected
• Exclude progressive/metabolic conditions if atypical

Management (Multidisciplinary)

• Physiotherapy: range of motion, gait training, orthotics
• Occupational therapy: ADL skills, upper limb function
• Speech therapy: feeding, communication
• Spasticity management:
  • Oral: baclofen, diazepam, dantrolene
  • Focal: botulinum toxin A injection (most effective for focal spasticity)
  • Intrathecal baclofen pump (generalized spasticity)
  • Selective dorsal rhizotomy (surgical)
• Seizure management: anticonvulsants per seizure type
• Nutrition: high caloric needs, gastrostomy feeding if severe dysphagia
• Orthopedic surgery: hip reconstruction, tendon lengthening

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10. Learning Disorders

Definition

Types (DSM-5)

• Most common learning disorder
• Impaired reading accuracy, fluency, comprehension
• Phonological processing deficit (core mechanism)
• Not due to intellectual disability, visual/hearing impairment, inadequate instruction
• Associated with ADHD in 40%

• Impaired written expression: spelling, grammar, punctuation, handwriting
• Not simply poor penmanship; includes difficulties with written composition

• Difficulty with number sense, arithmetic, and mathematical reasoning
• Persistent (not explained by instruction or IQ)

ADHD (Attention Deficit Hyperactivity Disorder)

• Prevalence: 5–10% children
• Core features: inattention, hyperactivity, impulsivity — present in ≥2 settings, onset before age 12
• Types: predominantly inattentive, predominantly hyperactive-impulsive, combined
• Diagnosis: clinical (DSM-5 criteria), no lab or imaging required; behavioral rating scales (Conners, Vanderbilt)
• Management:
  • First-line medications: methylphenidate (ages 6+), amphetamine salts; stimulants most effective
  • Preschool age (4–5 yrs): behavioral therapy first, methylphenidate if severe
  • Non-stimulants: atomoxetine (SNRI), guanfacine, clonidine
  • School accommodations: extended time, preferential seating, reduced workload

Autism Spectrum Disorder (ASD)

• Persistent deficits in social communication + restricted, repetitive behaviors
• Onset in early development; more common in males (4:1)
• Red flags: no babbling by 12 months, no words by 16 months, no 2-word phrases by 24 months, any regression
• Screening: M-CHAT-R/F at 18 and 24 months
• Diagnosis: ADOS-2, ADI-R (gold standard)
• Management: ABA therapy, speech therapy, OT, social skills training; risperidone/aripiprazole for irritability

Principles of Management (Learning Disorders)

• Early identification and intervention
• Individualized education program (IEP) or 504 plan
• Remediation strategies (phonics-based for dyslexia)
• Accommodation vs. modification
• Psychological support for child and family
• Address comorbidities (anxiety, depression, ADHD)

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11. Iron Deficiency Anemia (IDA)

Epidemiology

• Most common nutritional deficiency and cause of anemia worldwide
• Peak age: 6 months–3 years (dietary insufficiency after stores deplete) and adolescent girls (menstrual loss)

Stages of Iron Deficiency

1. Iron depletion: ↓ ferritin (storage iron), normal Hb, normal RBCs
2. Iron-deficient erythropoiesis: ↓ serum iron, ↑ TIBC, ↓ transferrin saturation, ↑ free erythrocyte protoporphyrin (FEP)
3. Iron deficiency anemia: microcytic, hypochromic anemia with all above changes

Etiology in Children

• Inadequate intake: cow's milk excess (>750 mL/day displaces iron-rich foods; low iron content, causes occult GI blood loss), prolonged exclusive breastfeeding without complementary feeding
• Poor absorption: cow's milk protein intolerance, celiac disease, H. pylori
• Increased demand: prematurity, low birth weight, twin pregnancy (depleted stores)
• Blood loss: Meckel's diverticulum, hookworm, inflammatory bowel disease, menorrhagia

Clinical Features

• Hematological: pallor, easy fatigability, tachycardia, high-output cardiac failure (severe)
• Non-hematological (pica, neurocognitive impact are key):
  • Pica (eating non-food items)
  • Restless leg syndrome
  • Cognitive impairment, decreased attention, poor school performance (even with mild ID)
  • Spoon-shaped nails (koilonychia), atrophic glossitis, angular stomatitis (severe/chronic)
  • Plummer-Vinson syndrome (web + dysphagia + IDA — rare, adult women)

Laboratory Findings

Differentiation: IDA vs Thalassemia Trait

Treatment

• Dietary: iron-rich foods (red meat, liver, dark leafy greens, fortified cereals), Vitamin C with meals (enhances absorption), avoid cow's milk >500 mL/day
• Therapeutic iron:
  • Oral ferrous sulfate: 3–6 mg/kg/day of elemental iron in 2–3 divided doses; given on empty stomach or with Vitamin C
  • Continue for 3 months after normalization of Hb (to replenish stores)
  • Reticulocytosis peaks at 5–10 days; Hb rises 1 g/dL/week
• IV iron: iron sucrose, ferric carboxymaltose — for malabsorption, intolerance, severe anemia with need for rapid repletion
• Blood transfusion: Hb <5–7 g/dL with cardiovascular compromise; packed RBCs 10 mL/kg slowly

Prevention

• Universal supplementation: all infants 4–6 months (breastfed) or formula with ≥12 mg/L iron
• Preterm/LBW: elemental iron 2 mg/kg/day from 4 weeks of life
• Delayed cord clamping (≥30–60 seconds): increases iron stores by ~30–40 mg
• Avoid introduction of cow's milk before 12 months
• NBS: hemoglobin/ferritin screening at 9–12 months in high-risk

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Quick Reference Summary Table

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