1. Stage of NEC: Bell Stage II (Proven NEC) showing Pneumatosis intestinalis (linear/cystic submucosal or subserosal gas within the bowel wall) and/or branching portal venous gas.
2. Radiological feature of Bell Stage IIIB: Pneumoperitoneum (free intraperitoneal air under diaphragm / football sign / Rigler sign indicating bowel perforation).
3. Other conditions with Pneumatosis Intestinalis:
   • Hirschsprung disease (Hirschsprung-associated enterocolitis)
   • Pseudomembranous enterocolitis / C. difficile colitis
   • Neonatal ulcerative/ischemic bowel disease / intestinal volvulus
   • Severe carbohydrate malabsorption / milk protein allergy enteropathy.

1. Diagnosis: Congenital Diaphragmatic Hernia (CDH) (left-sided Bochdalek hernia with intrathoracic bowel loops and mediastinal shift to the right).
2. Embryologic events: Failure of normal closure of the posterolateral pleuroperitoneal canal/membrane (foramen of Bochdalek) between the 8th and 10th weeks of gestation, allowing abdominal viscera to herniate into the thoracic cavity.
3. Causes of respiratory distress:
   • Pulmonary hypoplasia (decreased bronchial branching, alveolar surface area, and pulmonary vasculature in utero)
   • Mechanical compression of ipsilateral and contralateral lung by herniated abdominal viscera
   • Persistent Pulmonary Hypertension of the Newborn (PPHN) with right-to-left shunting.

1. Diagnosis: Esophageal Atresia with Tracheoesophageal Fistula (EA with TEF) (Type C / Gross Type III: proximal atresia with distal TEF; coiled red rubber catheter in the upper blind esophageal pouch with air in the GI tract).
2. Bad prognostic criteria (Waterston / Spitz criteria):
   • Long-gap esophageal atresia (gap between two esophageal ends $>3\text{--}4\text{ cm}$ / $>2\text{--}3$ vertebral bodies)
   • Birth weight $<1500\text{ g}$
   • Major associated congenital cardiac anomalies.
3. Requirement for preoperative 2D Echo:
   • Rule out associated congenital heart defects (part of VACTERL association)
   • Determine the sidedness of the aortic arch (right-sided aortic arch necessitates thoracotomy from the left side instead of standard right thoracotomy).

1. Condition: Collodion Baby (congenital ichthyosis encased in a taut, shiny, parchment-like collodion membrane with ectropion and eclabium).
2. Metabolic/Systemic complications:
   • Hypernatremic dehydration and massive transepidermal water loss
   • Hypothermia / impaired thermoregulation
   • Secondary skin sepsis / cutaneous infections
   • Constriction bands of digits.

1. Abnormality: Asymmetric crying facies with failure/absence of depression of the right lower lip and right angle of the mouth during crying (with normal forehead wrinkling and eye closure).
2. Diagnosis: Congenital Hypoplasia/Agenesis of Depressor Anguli Oris Muscle (DAOM) (Cayler Cardiofacial Syndrome).
3. Advised investigation: 2D Echocardiography (to screen for associated congenital heart defects such as VSD, ASD, tetralogy of Fallot, or 22q11 deletion syndrome).

1. Diagnosis: Congenital Syphilis (radiograph demonstrates osteochondritis, periostitis, and Wimberger sign / metaphyseal lucency of upper medial tibia).
2. Late manifestations of Congenital Syphilis:
   • Hutchinson teeth (notched, peg-shaped upper central incisors)
   • Mulberry molars (first lower molars with multiple poorly developed cusps)
   • Interstitial keratitis
   • Eighth nerve deafness (sensorineural hearing loss; completing Hutchinson's Triad)
   • Saber shins (anterior bowing of tibia)
   • Saddle nose deformity
   • Higouménakis sign (unilateral/bilateral enlargement of the sternal end of the clavicle)
   • Rhagades (linear perioral/perianal scars)
   • Clutton joints (painless symmetrical hydrarthrosis of knees)
   • Olympian brow (frontal bossing).
3. Treatment:
   • Aqueous crystalline penicillin G: $100,000\text{--}150,000\text{ U/kg/day}$ IV (administered as $50,000\text{ U/kg/dose}$ IV every 12 hours for first 7 days, then every 8 hours for a total of 10–14 days)
   • OR Procaine penicillin G: $50,000\text{ U/kg/day}$ IM once daily for 10–14 days.

1. Abnormality: Malpositioned umbilical arterial catheter with tip ascending abnormally into the right subclavian/brachiocephalic artery.
2. Ideal catheter positions:
   • Umbilical Arterial Catheter (UAC):
     • High line: T6 to T9 / T10 (thoracic aorta above diaphragm, below ductus arteriosus and above celiac axis)
     • Low line: L3 to L4 / L5 (lumbar aorta below inferior mesenteric artery and above aortic bifurcation).
   • Umbilical Venous Catheter (UVC): Inferior Vena Cava at the junction with the Right Atrium (level of diaphragm, T8–T9).
3. Management of pale/vasospastic lower limb:
   • Reflex vasodilation: Apply warm compresses to the contralateral limb (reflex heating)
   • If blanching/pallor persists $>15\text{--}30\text{ minutes}$, immediately withdraw and remove the arterial catheter.
4. Vertebral level of renal arteries: L1 to L2 vertebral body.
5. Maintenance of UAC: Continuous flush with heparinized saline infusion at $0.5\text{--}1.0\text{ IU/mL}$ (or $0.5\text{--}1\text{ U/hour}$) at a rate of $0.5\text{--}1.0\text{ mL/hour}$.

1. Diagnosis: Meconium Peritonitis / Meconium Ileus (abdominal radiograph shows diffuse scattered intra-abdominal/peritoneal calcifications and dilated bowel loops).
2. Genetic mutation: $\mathrm{\Delta }\text{F508}$ mutation in the CFTR gene on chromosome 7q31.2 (causing Cystic Fibrosis).

1. Caloric value of MCT oil: $7.6\text{--}8.3\text{ kcal/mL}$ ($\approx 7.6\text{ kcal/mL}$).
2. PPV initiation threshold: Heart rate $<100\text{ bpm}$ (or if apneic/gasping).
3. Heart disease in Down syndrome: Atrioventricular Septal Defect (AVSD / Endocardial Cushion Defect) ($\approx 40\text{--}50\mathrm{\%}$), followed by VSD.
4. Prokinetic macrolide: Erythromycin (low dose $1\text{--}3\text{ mg/kg}$ Q6H).
5. Janiceps twins: Cephalothoracopagus conjoined twins joined from head to lower chest with two faces on opposite sides of a single head.
6. Hydrocortisone dose: $1\text{ mg/kg/dose}$ IV every 8–12 hours (or $2.5\text{--}5\text{ mg/kg/day}$).

1. Caloric value of 1 sachet of HMF: $3.5\text{--}6.5\text{ kcal}$ per sachet (adds $4\text{ kcal}/100\text{ mL}$).
2. Depth of chest compressions: One-third ($1/3$) of the anteroposterior (AP) diameter of the chest ($\approx 1.5\text{ cm}$).
3. Cardiac defect in IDM: Asymmetric Septal Hypertrophy / Hypertrophic Cardiomyopathy (functional) and VSD / TGA (structural).
4. Pupillary light reflex: Appears between $28\text{ to }30\text{ weeks}$ of gestation (consistently present by 32 weeks).
5. Shunting level with equal pre- and post-ductal ${\text{pO}}_2$: Atrial level (Patent Foramen Ovale [PFO] / ASD).
6. Naloxone dose: $0.1\text{ mg/kg}$ IV/IM (Note: Routine naloxone is no longer recommended in initial NRP algorithms).

1. Protein in human milk: $0.9\text{--}1.1\text{ g}/100\text{ mL}$ (and $65\text{--}67\text{ kcal}/100\text{ mL}$).
2. AMBU pop-off valve pressure: $30\text{ to }40{\text{ cm H}}_2\text{O}$.
3. Feto-maternal hemorrhage incidence: $\approx 8\text{--}10\mathrm{\%}$ in uncomplicated pregnancies (up to $50\mathrm{\%}$ at delivery).
4. Most common drug in NICU: Oxygen / Ampicillin / Gentamicin.
5. Fetal IgM synthesis: Begins at $20\text{ to }30\text{ weeks}$ of gestation ($\approx 30\text{ weeks}$).
6. ${\text{PGE}}_1$ dose: $0.05\text{ to }0.1\mu \text{g/kg/min}$ IV infusion (can be titrated up to $0.4\mu \text{g/kg/min}$, then tapered to $0.01\text{--}0.025\mu \text{g/kg/min}$).

1. Endemic Goiter: Congenital hypothyroidism / Endemic Cretinism (neurological and myxedematous).
2. Graves' Disease: Transient neonatal thyrotoxicosis (due to transplacental transfer of TSH-receptor stimulating antibodies [TRAb/TSI]).
3. Hyperparathyroidism: Neonatal hypocalcemia and tetany (maternal hypercalcemia suppresses fetal parathyroid gland development).
4. Hypertension: Fetal growth restriction (IUGR), placental insufficiency, prematurity, oligohydramnios.
5. Myasthenia Gravis: Transient neonatal myasthenia gravis (due to transplacental anti-AChR antibodies).
6. Maternal SLE: Congenital Heart Block (complete AV block), neonatal lupus erythematosus (annular cutaneous rash, thrombocytopenia, neutropenia, hepatitis).
7. Poliomyelitis: Congenital poliomyelitis / neonatal paralysis, abortion/prematurity.
8. Coxsackie B: Fulminant neonatal myocarditis, meningoencephalitis, hepatitis.
9. Sickle Cell Anemia: Prematurity, low birth weight, IUGR, increased perinatal mortality.
10. Tuberculosis: Congenital tuberculosis (primary hepatic complex / caseating granulomas), prematurity, low birth weight.

1. Ideal timing: $15\text{ to }18\text{ weeks}$ of gestation (second trimester).
2. Most common indication: Advanced maternal age ($\ge 35\text{ years}$) at delivery (risk of fetal aneuploidy/Down syndrome).
3. Four other indications:
   • Positive maternal serum screening (triple/quadruple screen) or abnormal NIPT
   • Fetal structural anomalies detected on prenatal ultrasound
   • Previous child with chromosomal anomaly or neural tube defect
   • Either parent is a known balanced translocation or chromosomal inversion carrier
   • Known family history / carrier status for single-gene inborn errors of metabolism or monogenic disorders amenable to DNA/biochemical analysis.

1. Diagnosis: Hirschsprung Disease (Congenital Aganglionic Megacolon) (contrast enema demonstrates narrow aganglionic rectosigmoid transition zone with cone-shaped dilatation of proximal normal colon).
2. Rectal biopsy findings:
   • Complete absence of ganglion cells in the submucosal (Meissner) and myenteric (Auerbach) plexuses
   • Hypertrophied, coarse nerve bundles with markedly increased Acetylcholinesterase (AChE) activity on histochemical staining (or loss of Calretinin immunostaining).

1. X-ray finding & Diagnosis: Branching Portal Venous Gas extending to the periphery of the liver in Severe Necrotizing Enterocolitis (Bell Stage IIB/III).
2. Gas composition: Hydrogen gas (${\text{H}}_2$) produced by bacterial fermentation of unabsorbed luminal carbohydrates by enteric pathogens (Klebsiella, E. coli, Clostridium spp.).

1. Cause: Endobronchial intubation (Right main bronchus intubation) with resultant left lung atelectasis/complete collapse and right lung hyperinflation.
2. Action: Immediately withdraw/pull back the endotracheal tube (ETT) by $0.5\text{--}1\text{ cm}$ until the tip is positioned in the mid-trachea ($1\text{--}2\text{ cm}$ above the carina, at the T2–T3 vertebral level), and re-auscultate for bilateral equal air entry.

1. ICROP Staging of ROP:
   • Stage 1: Demarcation line separating vascularized from avascular retina
   • Stage 2: Ridge (demarcation line has height and width)
   • Stage 3: Extraretinal fibrovascular proliferation extending from the ridge
   • Stage 4: Subtotal retinal detachment (4A: extrafoveal; 4B: including fovea)
   • Stage 5: Total retinal detachment (funnel-shaped).
2. Aggressive Posterior ROP (AP-ROP / Rush Disease): Rapidly progressing, severe form of ROP characterized by posterior location (Zone I or posterior Zone II), prominent plus disease in all four quadrants, and flat neovascularization without progressing through typical stages 1 to 3.
3. Risk factors: Gestational age $<32\text{ weeks}$, birth weight $<1500\text{ g}$, unmonitored/fluctuating oxygen therapy, sepsis, mechanical ventilation, multiple blood transfusions, poor postnatal weight gain.
4. Anti-VEGF therapy: Intravitreal injection of Bevacizumab (Avastin) or Ranibizumab.

1. Bedside test: Cold-light Chest Transillumination Test (using a fiberoptic transilluminator/Fibre-optic light probe).
2. Diagnosis: Tension Pneumothorax (or pneumomediastinum). The affected hemithorax lights up brilliantly with a wide, glowing halo of light transmission across the chest wall compared to the unaffected side.

• Image A: Arthrogryposis Multiplex Congenita (multiple congenital joint contractures).
• Image B: Setting-sun eye sign (downward deviation of eyes in congenital hydrocephalus / increased ICP).
• Image C: Russell-Silver Syndrome (triangular facies, prominent forehead, downturned mouth, asymmetry).
• Image D: Omphalocele (Exomphalos) (midline abdominal wall defect covered by peritoneal-amniotic sac with umbilical cord inserting at apex).

For Image D (Omphalocele):

1. Precaution & Transport:
   • Cover defect with sterile, warm, saline-soaked gauze and place in a sterile plastic bowel bag / plastic wrap to prevent heat loss, drying, and infection.
   • Decompress stomach with an open-to-air orogastric tube.
   • Maintain NPO, start IV fluids and broad-spectrum antibiotics.
   • Nurse in supine position (avoid prone or lateral compression of sac).
2. Associated Syndrome: Beckwith-Wiedemann Syndrome (macroglossia, gigantism, hypoglycemia, omphalocele) or Trisomy 13/18.

Part 1 (Barium Study):

1. Finding: Smooth, tapered "bird's beak" or "pencil-tip" narrowing of the gastroesophageal junction with marked proximal esophageal dilatation.
2. Diagnosis: Achalasia Cardia.
3. Pathophysiology: Loss/degeneration of inhibitory nitric oxide/VIP-producing ganglion cells in the myenteric (Auerbach) plexus $\to$ failure of lower esophageal sphincter (LES) relaxation and aperistalsis of esophageal body.
4. Most sensitive diagnostic test: High-Resolution Esophageal Manometry.
5. Medical agents: Calcium channel blockers (Nifedipine), Botulinum toxin injection into LES, PDE-5 inhibitors.
6. Interventions: Laparoscopic Heller's cardiomyotomy (with fundoplication), Per-Oral Endoscopic Myotomy (POEM), Pneumatic balloon dilatation.

Part 2 (Chest Radiograph):

1. Finding: Retrosternal/anterior paracardiac mass or bowel gas loops in anterior thorax suggestive of Morgagni Diaphragmatic Hernia (anterior retrosternal diaphragmatic hernia).
2. Clinical presentations:
   • Asymptomatic (incidental radiological finding)
   • Recurrent chest infections / wheezing / pneumonia
   • Vomiting, postprandial discomfort, and GERD symptoms
   • Acute intestinal obstruction or strangulation.

1. Investigation & Diagnosis: 2D Echocardiography with Color Doppler; Diagnosis is Hemodynamically Significant Patent Ductus Arteriosus (hsPDA).
2. Echocardiographic criteria for hsPDA:
   • Internal ductal diameter $>1.5\text{ mm}$ (or $>1.4\text{ mm/kg}$)
   • Left Atrium to Aortic Root ratio ($\text{LA/Ao}$) $>1.4\text{--}1.5:1$
   • Retrograde diastolic flow / absent diastolic flow in descending aorta
   • High Left Ventricular Output ($>300\text{ mL/kg/min}$).
3. Indications for treatment: Signs of congestive heart failure, ventilator dependency / inability to wean respiratory support, recurrent pulmonary hemorrhage or apnea, hsPDA on echo.
4. Standard medical drugs: Indomethacin IV and Ibuprofen (oral or IV).
5. Newer alternative drug: Intravenous Paracetamol (Acetaminophen) ($15\text{ mg/kg}$ Q6H for 3–7 days).

1. Labeled structures:
   • a: Optic Nerve / Disc
   • b: Ora Serrata
   • c: Zone 1 (circle with radius twice the distance from optic disc to macula)
   • d: Macula / Fovea
   • e: Zone 3 (outer crescent of retina anterior to Zone 2)
   • f: Zone 2 (extends from Zone 1 to nasal ora serrata).
2. Most sensitive zone: Zone 1, because it contains the macula and optic nerve head; immature vascularization here represents the highest risk of blinding retinal detachment.
3. Indications for treatment (Type 1 ROP / ETROP criteria):
   • Zone 1: Any stage ROP with Plus disease
   • Zone 1: Stage 3 ROP without Plus disease
   • Zone 2: Stage 2 or 3 ROP with Plus disease.
4. Remote screening modality: Wide-field Digital Retinal Photography (RetCam) via Tele-ROP screening networks (e.g., KIDROP).

1. Indications for TPN in VLBW/ELBW:
   • Birth weight $<1000\text{ g}$ (ELBW) or $<1500\text{ g}$ (VLBW) anticipated to not reach significant enteral feeds by day 3–5
   • Severe gastrointestinal anomalies (gastroschisis, omphalocele, intestinal atresia)
   • Severe necrotizing enterocolitis (NEC) / short bowel syndrome.
2. Protein-to-Energy ratio: $3\text{ to }4\text{ g protein per }100\text{ non-protein kcal}$ ($150\text{--}200\text{ kcal per g nitrogen}$).
3. Caloric distribution:
   • Carbohydrates (Dextrose): $50\text{--}55\mathrm{\%}$ of total calories
   • Lipids: $30\text{--}35\mathrm{\%}$ of total calories
   • Proteins (Amino acids): $10\text{--}15\mathrm{\%}$ of total calories.
4. Mineral requirements in TPN:
   • Calcium: $60\text{--}80\text{ mg/kg/day}$ (up to $150\text{--}200\text{ mg/kg/day}$ for osteopenia prophylaxis)
   • Phosphorus: $45\text{--}60\text{ mg/kg/day}$ (Ca:P molar ratio $1.3\text{--}1.7:1$)
   • Magnesium: $7\text{--}10\text{ mg/kg/day}$ ($0.3\text{--}0.5\text{ mEq/kg/day}$).

1. Diagnosis: Congenital Hypothyroidism (Cretinism).
2. Most common cause: Thyroid Dysgenesis ($\approx 85\mathrm{\%}$, including thyroid ectopia, hypoplasia, or athyreosis).
3. Newborn screening: Dried heel-prick blood spot on Guthrie filter paper collected at $48\text{ to }72\text{ hours}$ of life for TSH estimation (and/or total/free ${\text{T}}_4$).
4. Treatment timing & dose:
   • Must be initiated within the first 2 weeks of life ($<14\text{ days}$) to ensure normal IQ and prevent irreversible mental retardation.
   • Levothyroxine (${\text{L-T}}_4$): $10\text{ to }15\mu \text{g/kg/day}$ orally as a single daily dose crushed in breast milk.

1. Diagnosis: Cardiac Tamponade / Pericardial Effusion secondary to PICC line perforation/extravasation.
2. Differential diagnoses for acute neonatal collapse:
   • Tension pneumothorax
   • Septic shock / overwhelming neonatal sepsis
   • Duct-dependent congenital heart disease (closure of ductus)
   • Inborn Errors of Metabolism (IEM) / acute metabolic decompensation
   • Severe intraventricular hemorrhage (IVH Grade IV).
3. Cause: Erosion / transmural perforation of the right atrial or superior vena cava wall by the tip of the centrally placed PICC line with extravasation of hypertonic TPN fluid into the pericardial sac.
4. Emergency management:
   • Immediate subxiphoid emergency pericardiocentesis / pericardial tap to aspirate fluid and relieve hemodynamic compromise
   • Immediately stop TPN infusion and withdraw/remove the central catheter
   • Confirm needle/catheter position by bedside echocardiography / contrast fluoroscopy
   • Resuscitate with IV volume expanders and inotropes as needed.