Neonatology Practice Questions

Q: The neonatal period extends up to which day of life?

28 days. **Explanation:** The **neonatal period** is defined as the first **28 days of life**. This period is further subdivided into two phases based on the physiological changes and risks associated with the newborn: 1. **Early Neonatal Period:** Birth to 7 completed days (0–6 days). This is the period of highest mortality, primarily due to birth asphyxia, prematurity, and congenital anomalies. 2. **Late Neonatal Period:** From 7 completed days to 28 days (7–28 days). Deaths in this period are often attributed to infections like neonatal sepsis and pneumonia. **Analysis of Options:** * **Option C (28 days):** This is the standard definition used by the WHO and the National Neonatology Forum (NNF). It represents the first four weeks of life, a critical window for survival. * **Option A & D (21 and 35 days):** These are arbitrary numbers with no clinical or statistical significance in pediatric classification. * **Option B (30 days):** While a calendar month is roughly 30 days, the medical definition strictly adheres to the 28-day (4-week) rule. **High-Yield NEET-PG Pearls:** * **Perinatal Period:** Starts from **28 weeks of gestation** and ends at **7 days after birth**. * **Infancy:** Extends from birth to **1 year** of age. * **Neonatal Mortality Rate (NMR):** Defined as the number of neonatal deaths per 1,000 live births. It is a key indicator of a country’s socioeconomic status and newborn care facilities. * **Most common cause of Neonatal Mortality in India:** Prematurity and Low Birth Weight (LBW), followed by infection (Sepsis).

Q: Floppy baby syndrome occurs due to fetal exposure to which of the following?

Lithium. **Explanation:** **Floppy Baby Syndrome** (neonatal hypotonia) occurs due to fetal exposure to **Lithium** during pregnancy. Lithium is a mood stabilizer used for bipolar disorder that crosses the placenta. When taken near term, it can cause neonatal lithium toxicity, characterized by lethargy, poor suck reflex, cyanosis, and marked hypotonia (the "floppy" appearance). Additionally, first-trimester exposure to Lithium is classically associated with **Ebstein’s anomaly** (tricuspid valve displacement). **Analysis of Incorrect Options:** * **Warfarin (A):** Exposure leads to **Fetal Warfarin Syndrome**, characterized by nasal hypoplasia, stippled epiphyses (chondrodysplasia punctata), and CNS defects. It does not typically present as acute neonatal floppiness. * **Valproate (B):** Primarily associated with **Neural Tube Defects** (e.g., spina bifida) due to interference with folate metabolism, as well as "Fetal Valproate Syndrome" (craniofacial dysmorphism). * **Phenytoin (C):** Causes **Fetal Hydantoin Syndrome**, presenting with midface hypoplasia, cleft lip/palate, and digital hypoplasia (hypoplastic nails/phalanges). **NEET-PG High-Yield Pearls:** * **Lithium Toxicity:** Apart from floppiness, it can cause neonatal diabetes insipidus and thyroid dysfunction. * **Management:** Most cases of Lithium-induced floppiness are self-limiting as the drug is cleared by the neonate’s kidneys; however, hydration is key. * **Other causes of Floppy Baby:** Must be differentiated from Down Syndrome (most common chromosomal cause), Spinal Muscular Atrophy (SMA Type 1), and Prader-Willi Syndrome. * **Drug of choice for Bipolar in Pregnancy:** Lamotrigine is often preferred over Lithium/Valproate due to a lower teratogenic profile.

Q: Meconium contains all except?

Bacterial flora. **Explanation:** **Meconium** is the first stool passed by a newborn, typically within the first 24–48 hours of life. The key to this question lies in the **sterile environment** of the fetal gastrointestinal tract. **Why "Bacterial Flora" is the correct answer:** In utero, the fetal gut is considered sterile. Colonization by bacteria (bacterial flora) only begins **after birth** through exposure to the mother’s vaginal flora, skin, and breastfeeding/formula feeding. Therefore, true meconium—which is formed in utero—does not contain bacterial flora. **Analysis of Incorrect Options:** * **Lanugo (A):** These are fine fetal hairs that are shed into the amniotic fluid. The fetus swallows amniotic fluid, leading to the presence of lanugo in the meconium. * **Epithelial debris (C):** Squamous cells (vernix caseosa) are shed from the fetal skin into the amniotic fluid and subsequently swallowed, forming a significant portion of the meconium bulk. * **Bilirubin (D):** Meconium contains bile pigments (mainly biliverdin and bilirubin), which give it its characteristic dark green-to-black color. **High-Yield Clinical Pearls for NEET-PG:** * **Composition:** Meconium consists of 70-80% water, amniotic fluid components (lanugo, skin cells), intestinal secretions, and bile. * **Delayed Passage:** Failure to pass meconium within 48 hours should raise suspicion for **Hirschsprung disease** or **Meconium Ileus** (associated with Cystic Fibrosis). * **Meconium Aspiration Syndrome (MAS):** Occurs when the fetus passes meconium in utero (often due to fetal distress/hypoxia) and aspirates it, leading to chemical pneumonitis. * **Microbiology:** While traditionally considered sterile, recent advanced molecular studies suggest the presence of some low-level microbial DNA, but for standard clinical examinations like NEET-PG, **meconium is considered sterile.**

Q: Which of the following are complications seen in infants of diabetic mothers?

All of these. **Explanation:** Infants of Diabetic Mothers (IDM) face a spectrum of complications due to maternal hyperglycemia, which leads to fetal hyperinsulinemia (Pedersen Hypothesis). Since insulin is the primary anabolic hormone for the fetus, this state results in various multisystemic issues. * **Macrosomia (Option A):** Excess maternal glucose crosses the placenta, stimulating fetal pancreatic beta cells to secrete insulin. This causes increased fat deposition and organomegaly (except for the brain), leading to birth weights >4000g or >90th percentile. * **Neural Tube Defects (Option B):** Poor glycemic control during the period of organogenesis (first trimester) is teratogenic. IDMs have a 2-3 fold increased risk of congenital anomalies. While **Sacral Agenesis (Caudal Regression Syndrome)** is the most specific, **Neural Tube Defects** and Congenital Heart Diseases (e.g., VSD, Transposition of Great Arteries) are more common in absolute numbers. * **Hypocalcemia (Option C):** This typically occurs within the first 24–72 hours. It is attributed to functional hypoparathyroidism in the newborn, often exacerbated by maternal magnesium loss through urine, leading to neonatal hypomagnesemia which suppresses Parathyroid Hormone (PTH) release. **Clinical Pearls for NEET-PG:** * **Most common metabolic abnormality:** Hypoglycemia (due to persistent hyperinsulinemia after the cord is cut). * **Most common cardiac anomaly:** Ventricular Septal Defect (VSD). * **Most specific anomaly:** Caudal Regression Syndrome (Sacral Agenesis). * **Respiratory Distress:** IDMs are at higher risk for Respiratory Distress Syndrome (RDS) because hyperinsulinism antagonizes cortisol, delaying surfactant production by Type II pneumocytes. * **Hematology:** Polycythemia is common due to fetal hypoxemia stimulating erythropoietin.

Q: All of the following cause jaundice at birth or within 24 hours EXCEPT?

Physiological jaundice. **Explanation:** Jaundice appearing **within the first 24 hours of life** is always considered **pathological**. **1. Why Physiological Jaundice is the correct answer:** Physiological jaundice occurs due to the transient inability of the immature neonatal liver to conjugate bilirubin. It typically appears **after 24 hours** of life (usually between 48–72 hours), peaks around day 4–5, and disappears by day 10–14. Since the question asks for causes *except* those appearing within 24 hours, physiological jaundice is the correct choice. **2. Analysis of Incorrect Options (Causes of Jaundice < 24 hours):** * **Hemolytic disease of the newborn:** Conditions like Rh incompatibility or ABO incompatibility cause rapid red cell destruction immediately after birth, leading to early unconjugated hyperbilirubinemia. * **Crigler-Najjar Syndrome:** This is a rare genetic deficiency of the enzyme UDP-glucuronosyltransferase (UGT1A1). Type 1 presents with severe, non-hemolytic unconjugated jaundice almost immediately after birth. * **Intrauterine infections (TORCH):** Infections like CMV, Rubella, or Toxoplasmosis cause hepatitis and biliary obstruction, leading to **conjugated hyperbilirubinemia** present at or shortly after birth. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any jaundice in the first 24 hours, bilirubin rising >5 mg/dL/day, or conjugated bilirubin >2 mg/dL is **pathological**. * **Most common cause** of jaundice in the first 24 hours: Hemolytic disease (Rh/ABO incompatibility). * **Kramer’s Rule:** Used for clinical assessment of jaundice; it progresses in a **cephalo-caudal** direction (Head to Toe). * **Biliary Atresia:** Usually presents later (2–4 weeks) with conjugated jaundice and clay-colored stools.

Question 1

The neonatal period extends up to which day of life?

Accepted Answer

28 days

Answer

21 days

Answer

30 days

Answer

35 days

Question 2

Floppy baby syndrome occurs due to fetal exposure to which of the following?

Accepted Answer

Lithium

Answer

Warfarin

Answer

Valproate

Answer

Phenytoin

Question 3

A neonate born to a hyperthyroid mother can present with which of the following conditions, except?

Accepted Answer

None of the above

Answer

Goitrous thyrotoxicosis

Answer

Goitrous hypothyroidism

Answer

Non-goitrous hypothyroidism

Question 4

Meconium contains all except?

Accepted Answer

Bacterial flora

Answer

Lanugo

Answer

Epithelial debris

Answer

Bilirubin

Question 5

Which of the following are complications seen in infants of diabetic mothers?

Accepted Answer

All of these

Answer

Macrosomia

Answer

Neural tube defect

Answer

Hypocalcemia

Question 6

A newborn has meconium aspiration. Despite three attempts at resuscitation, there is no breathing. What is the next step in resuscitation?

Accepted Answer

Trikling of the sole

Answer

Chest compressions

Answer

Oxygen inhalation

Answer

Bag and mask ventilation

Question 7

Which of the following conditions is NOT associated with surfactant deficiency?

Accepted Answer

Infant of a diabetic mother

Answer

Meconium aspiration syndrome

Answer

Transient tachypnea of the newborn

Answer

Bronchopulmonary dysplasia

Question 8

According to the perinatal risk stratification of preterm neonates and developmental outcomes, which of the following constitutes a moderate risk category?

Accepted Answer

Gestation 30-32 weeks, birth weight 1000-1500 gm, 1-3 days of hypoglycemia

Answer

Gestation < 28 weeks, birth weight 1251-1500 gm, 1-4 days of hypoglycemia

Answer

Gestation < 28 weeks, birth weight <1250 gm, 1-4 days of hypoglycemia

Answer

Gestation 30-32 weeks, birth weight 1251-1500 gm, more than 5 days of hypoglycemia

Question 9

All of the following cause jaundice at birth or within 24 hours EXCEPT?

Accepted Answer

Physiological jaundice

Answer

Hemolytic disease of the newborn

Answer

Crigler-Najjar syndrome

Answer

Intrauterine infections (TORCH)

Question 10

A male baby born at term with an uncomplicated pregnancy, labor, and delivery developed severe respiratory distress within a few hours of birth. His chest X-ray revealed a normal heart shadow and fine reticulonodular infiltrates radiating from the hilum. Echocardiogram findings revealed no abnormality, and the results of routine cultures were also negative. Family history reveals a similar clinical course and death of a male sibling at 1 month and a female sibling at 2 months of age, respectively. What is the most likely diagnosis?

Accepted Answer

Neonatal Alveolar Proteinosis

Answer

Total Anomalous Pulmonary Venous Circulation (TAPVC)

Answer

Meconium Aspiration Syndrome

Answer

Diffuse Herpes simplex infection

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?