Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 171: The serum of a newborn infant reveals a 1:32 cytomegalovirus (CMV) titer. The child is clinically asymptomatic. Which of the following courses of action would be advisable?

A. Repeat the CMV titer immediately
B. Wait 6 months and obtain another titer on the baby
C. Obtain an anti-CMV IgM titer from the mother
D. Obtain an anti-CMV IgM titer from the baby (Correct Answer)

Explanation: **Explanation:** The core concept here is distinguishing between **maternally derived passive immunity** and an **active neonatal infection**. 1. **Why Option D is correct:** IgG antibodies (which make up the initial 1:32 titer) can cross the placenta from the mother to the fetus. Therefore, a positive IgG titer in a newborn does not confirm congenital infection; it may simply reflect the mother’s past exposure. However, **IgM antibodies do not cross the placenta.** If the baby has a positive anti-CMV IgM titer, it indicates that the infant’s own immune system is producing antibodies in response to an active infection. This is the standard serological method to diagnose congenital CMV in an asymptomatic neonate. 2. **Why the other options are incorrect:** * **Option A:** Repeating the same titer immediately provides no new information, as it will still reflect the same mix of maternal and fetal IgG. * **Option B:** Waiting 6 months is dangerous. While maternal IgG disappears by 6–12 months, congenital CMV requires early identification to monitor for late-onset complications like sensorineural hearing loss (SNHL). * **Option C:** The mother’s IgM status only indicates her recent infection status; it does not confirm whether the virus was transmitted to the fetus. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** The most definitive test for congenital CMV is **PCR or viral culture of urine or saliva** obtained within the first 3 weeks of life. * **Most Common Presentation:** Most neonates (90%) are **asymptomatic** at birth, but 10-15% of these will develop progressive **Sensorineural Hearing Loss (SNHL)**. * **Classic Triad (Symptomatic):** Periventricular calcifications, microcephaly, and chorioretinitis. * **Treatment:** Oral Valganciclovir or IV Ganciclovir is indicated for symptomatic disease to improve hearing and neurodevelopmental outcomes.

Question 172: What is considered a prelacteal feed?

A. Cow's milk
B. Honey
C. Water
D. None of the above (Correct Answer)

Explanation: **Explanation:** The concept of **prelacteal feeding** refers to any food or liquid given to a newborn before the initiation of breastfeeding (i.e., before the mother’s milk or colostrum is first offered). In the context of this specific question, the answer is **D (None of the above)** because, according to standard medical definitions and WHO/UNICEF guidelines, **all three options (Cow’s milk, Honey, and Water) are technically considered prelacteal feeds** if administered before the first breastfeed. Since the question asks "What is considered a prelacteal feed?" and all options A, B, and C fit the definition, the structure of the question implies that either all are correct or the examiner is testing the strict exclusion of these substances from a healthy neonatal diet. **Breakdown of Options:** * **A. Cow’s milk:** Often used as a substitute, but it is a prelacteal feed that carries risks of allergy and infection. * **B. Honey:** A traditional prelacteal feed in many cultures; however, it is strictly contraindicated in infants due to the risk of **Infant Botulism** (*Clostridium botulinum* spores). * **C. Water/Glucose water:** Frequently given under the misconception of hydration, but it interferes with the establishment of lactation and increases the risk of neonatal jaundice and hyponatremia. **Clinical Pearls for NEET-PG:** * **Colostrum:** Known as the "first vaccine," it is rich in IgA and growth factors. It should be started within **one hour** of birth (Golden Hour). * **Risks of Prelacteal Feeds:** They are discouraged because they increase the risk of diarrheal diseases, interfere with suckling reflex, and deprive the infant of the immunological benefits of colostrum. * **Exclusive Breastfeeding (EBF):** Defined as giving *only* breast milk (including expressed milk) and no other liquids or solids, not even water, with the exception of ORS, drops, or syrups (vitamins/minerals/medicines).

Question 173: A 3-day-old preterm neonate presented with breathing difficulty from birth and was admitted to the NICU. A chest X-ray was performed, showing diffuse bilateral opacities. Which of the following disorders is the neonate most likely suffering from?

A. Respiratory distress syndrome (Correct Answer)
B. Neonatal pneumonia
C. Transient tachypnea of the newborn
D. None of these

Explanation: **Explanation:** The clinical presentation and radiological findings point towards **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease. **1. Why Respiratory Distress Syndrome is correct:** RDS is primarily a disease of **preterm neonates** caused by a deficiency of **surfactant** (produced by Type II pneumocytes). Surfactant reduces alveolar surface tension; its absence leads to widespread alveolar collapse (atelectasis). * **Clinical Presentation:** Respiratory distress (tachypnea, grunting, retractions) starting almost immediately after birth. * **Radiology:** The classic X-ray finding is **diffuse, bilateral, symmetrical opacities** with a "ground-glass" appearance and **air bronchograms**. In severe cases, "white-out" lungs may be seen. **2. Why other options are incorrect:** * **Neonatal Pneumonia:** While it can cause diffuse opacities, it is usually associated with a history of prolonged rupture of membranes or maternal fever. Radiologically, it often presents with patchy, asymmetrical infiltrates rather than uniform ground-glass opacities. * **Transient Tachypnea of the Newborn (TTN):** This typically affects **term or late-preterm** infants (often post-LSCS). It is caused by delayed clearance of fetal lung fluid. X-ray shows prominent vascular markings, fluid in the fissures, and hyperinflation, not diffuse opacities. **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Prematurity (most common), maternal diabetes, and cesarean section without labor. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates lung immaturity. * **Management:** Antenatal steroids (Dexamethasone/Betamethasone) to the mother; Surfactant replacement therapy and CPAP for the neonate. * **Complications:** Bronchopulmonary dysplasia (BPD), Retinopathy of Prematurity (ROP), and Intraventricular hemorrhage (IVH).

Question 174: Which of the following is a known complication of Cytomegalovirus (CMV) infection in neonates?

A. Intrauterine Growth Restriction (IUGR) (Correct Answer)
B. Sepsis
C. Hydrocephalus
D. Thrombocytosis

Explanation: **Explanation:** Congenital Cytomegalovirus (CMV) is the most common intrauterine infection worldwide. It primarily affects the vascular endothelium and organ parenchyma, leading to significant systemic manifestations. **1. Why Option A is Correct:** **Intrauterine Growth Restriction (IUGR)** is a hallmark of congenital CMV. The virus infects the placenta (villitis), leading to placental insufficiency. Furthermore, direct viral replication in fetal tissues causes cell death and inhibits mitosis, resulting in a baby that is "Small for Gestational Age" (SGA) with associated **microcephaly**. **2. Why the Other Options are Incorrect:** * **B. Sepsis:** While CMV is a systemic infection, "Sepsis" typically refers to acute bacterial infections (like GBS or E. coli) presenting with hemodynamic instability. CMV presents as a chronic, multisystemic "TORCH" syndrome. * **C. Hydrocephalus:** This is classically associated with **Congenital Toxoplasmosis**. CMV, conversely, causes brain destruction and atrophy, leading to **ventriculomegaly** (secondary to loss of brain parenchyma) and **microcephaly**, rather than obstructive hydrocephalus. * **D. Thrombocytosis:** CMV typically causes **Thrombocytopenia** (low platelet count), which manifests clinically as a "Blueberry muffin rash" (extramedullary hematopoiesis) and petechiae. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Microcephaly, Periventricular calcifications, and Sensorineural Hearing Loss (SNHL). * **SNHL:** CMV is the most common non-genetic cause of SNHL in children. * **Imaging:** CT/USG Head shows **periventricular calcifications** (vs. diffuse parenchymal calcifications in Toxoplasmosis). * **Diagnosis:** Gold standard is **Viral culture or PCR of saliva/urine** within the first 3 weeks of life. * **Treatment:** Intravenous Ganciclovir or oral Valganciclovir.

Question 175: Which of the following babies has the least risk of developing hypoglycemia?

A. A baby born to a mother treated with beta-blockers
B. Infant of a diabetic mother
C. Appropriate for gestational age babies (Correct Answer)
D. Intrauterine growth restriction (IUGR) babies

Explanation: **Explanation:** Neonatal hypoglycemia is defined as a plasma glucose level of **<40 mg/dL** in the first 24 hours of life and **<50 mg/dL** thereafter. The risk of hypoglycemia depends on the balance between glucose stores (glycogen), metabolic demand, and hormonal regulation. **Why Option C is Correct:** **Appropriate for Gestational Age (AGA)** babies have normal glycogen stores in the liver and skeletal muscle, a balanced insulin-to-glucagon ratio, and an average metabolic rate. Since they have neither the excessive demand nor the depleted stores seen in high-risk categories, they have the **least risk** of hypoglycemia. **Analysis of Incorrect Options:** * **Infant of Diabetic Mother (IDM):** Maternal hyperglycemia leads to fetal hyperglycemia, which causes **fetal hyperinsulinism**. After birth, the glucose supply is cut off, but high insulin levels persist, causing rapid glucose uptake and profound hypoglycemia. * **Intrauterine Growth Restriction (IUGR):** These babies have **depleted glycogen and fat stores** due to placental insufficiency. They also have a relatively larger brain-to-body mass ratio, leading to increased glucose consumption. * **Maternal Beta-Blockers:** Drugs like Propranolol or Labetalol cross the placenta and can cause neonatal hypoglycemia by **inhibiting glycogenolysis** and masking the sympathetic warning signs of low blood sugar. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of neonatal hypoglycemia: Transient hyperinsulinism (IDM). * **Beckwith-Wiedemann Syndrome:** A classic high-yield association featuring macrosomia, omphalocele, macroglossia, and hyperinsulinemic hypoglycemia. * **Treatment:** Asymptomatic cases are managed with early breastfeeding; symptomatic cases require an **IV bolus of 2 ml/kg of 10% Dextrose (D10W)** followed by a continuous glucose infusion rate (GIR) of 6–8 mg/kg/min.

Question 176: A newborn baby presents with a scaphoid abdomen and respiratory difficulty. Which of the following is the most probable condition?

A. Intestinal agenesis
B. Intestinal obstruction
C. Congenital diaphragmatic hernia (Correct Answer)
D. All of these

Explanation: **Explanation:** The clinical presentation of a **scaphoid abdomen** (a concave or "sunken" abdominal wall) associated with immediate **respiratory distress** in a newborn is a classic hallmark of **Congenital Diaphragmatic Hernia (CDH)**. **1. Why CDH is the correct answer:** In CDH, there is a defect in the diaphragm (most commonly the left-sided **Bochdalek hernia**). This allows abdominal viscera (stomach, intestines, spleen) to herniate into the thoracic cavity during fetal development. Because the abdominal contents are located in the chest, the abdomen appears empty or "scaphoid." The presence of these organs in the thorax causes **pulmonary hypoplasia** and secondary pulmonary hypertension, leading to severe respiratory distress at birth. **2. Why other options are incorrect:** * **Intestinal obstruction:** This typically presents with a **distended (protuberant) abdomen**, not a scaphoid one, due to the accumulation of gas and fluid proximal to the site of obstruction. * **Intestinal agenesis:** Similar to obstruction, this would lead to proximal bowel dilatation and abdominal distension or a normal abdominal contour, but not the characteristic "hollowed-out" appearance seen when the gut is entirely absent from the abdominal cavity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Posterolateral defect on the **left side** (Bochdalek Hernia). * **Diagnosis:** Antenatal USG or postnatal Chest X-ray showing air-filled bowel loops in the hemithorax and a mediastinal shift. * **Management Tip:** **Avoid bag-and-mask ventilation**, as it distends the herniated bowel with air, further compressing the lungs. Immediate management involves endotracheal intubation and gentle ventilation. * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and shifted apex beat (usually to the right).

Question 177: A term baby developed jaundice on the 3rd day, extending up to the thigh, with normal stool and urine. The mother's blood group is 'O' negative and the baby's is 'A' positive. What is the most likely cause of this jaundice?

A. Rh incompatibility
B. Physiological jaundice (Correct Answer)
C. Extrahepatic biliary atresia
D. Sepsis

Explanation: ### **Explanation** The correct answer is **Physiological Jaundice**. **1. Why Physiological Jaundice is correct:** In this scenario, the jaundice appears on the **3rd day** of life, which is the classic timing for physiological jaundice (typically appearing between 48–72 hours). The extension to the **thigh** corresponds to a Kramer’s scale of 3, suggesting a serum bilirubin level of approximately 8–12 mg/dL, which is within the expected range for physiological jaundice in a term neonate. The presence of normal-colored stool and urine rules out conjugated hyperbilirubinemia. **2. Why the other options are incorrect:** * **Rh Incompatibility:** Although the mother is Rh-negative and the baby is Rh-positive, Rh-induced hemolysis typically causes **pathological jaundice** within the **first 24 hours** of life. It is usually more severe and associated with anemia and hepatosplenomegaly. * **Extrahepatic Biliary Atresia:** This presents as **cholestatic (conjugated) jaundice**, usually appearing after the 2nd week of life. It is characterized by **clay-colored stools** and dark urine, which contradicts the findings in this case. * **Sepsis:** While sepsis can cause jaundice, it is usually accompanied by "danger signs" such as lethargy, poor feeding, temperature instability, or vomiting. This baby is otherwise normal. ### **NEET-PG High-Yield Pearls** * **Kramer’s Rule:** Jaundice progresses in a **cephalo-caudal** direction. (Face: 5 mg/dL; Chest/Upper Abdomen: 10 mg/dL; Lower Abdomen/Thighs: 12 mg/dL; Arms/Lower Legs: 15 mg/dL; Palms/Soles: >15 mg/dL). * **Pathological Jaundice Criteria:** Jaundice in the first 24 hours, bilirubin rising >5 mg/dL/day, or direct bilirubin >2 mg/dL. * **ABO vs. Rh Incompatibility:** ABO incompatibility (Mother O, Baby A/B) is more common but milder; Rh incompatibility is more severe but less common due to Anti-D prophylaxis.

Question 178: At what gestational age is a newborn typically fed?

A. 30 weeks (Correct Answer)
B. 33 weeks
C. 27 weeks
D. 34 weeks

Explanation: The coordination of sucking, swallowing, and breathing is a complex developmental milestone in neonates. Understanding the maturation of these reflexes is crucial for determining the route of feeding in preterm infants. **Explanation of the Correct Answer (A):** The coordination of **sucking and swallowing** typically begins to develop around **28 weeks** of gestation and becomes functional enough to initiate oral (enteral) feeding by **30 weeks**. While full coordination with breathing (to prevent aspiration) usually matures by 32–34 weeks, 30 weeks is the clinical threshold where minimal enteral nutrition or trophic feeding is often introduced via gavage or assisted methods to stimulate gut maturation. **Analysis of Incorrect Options:** * **B (33 weeks):** By this age, most infants have well-developed suck-swallow-breathe coordination and can often transition from tube feeding to breastfeeding or bottle-feeding. * **C (27 weeks):** At this gestation, the reflexes are immature. Feeding at this stage carries a high risk of aspiration and necrotizing enterocolitis (NEC); these infants are primarily managed with Total Parenteral Nutrition (TPN). * **D (34 weeks):** This is the age by which a healthy preterm infant is expected to be able to take **full oral feeds** independently. It is the "completion" stage rather than the "initiation" stage. **High-Yield Clinical Pearls for NEET-PG:** * **Sucking reflex** appears at 28 weeks; **Swallowing reflex** appears at 12–14 weeks (in utero). * **Coordination** of suck-swallow-breathe is established by **32–34 weeks**. * **Trophic feeding** (minimal enteral nutrition) is usually started at 0.5–1 ml/kg/hr to prevent gut atrophy. * **Rooting reflex** is well-established by 32 weeks and disappears by 3–4 months.

Question 179: All of the following are components of Kangaroo Mother Care except?

A. Skin-to-skin contact
B. Free nutritional supplements (Correct Answer)
C. Early discharge and follow-up
D. Exclusive breastfeeding

Explanation: ### Explanation Kangaroo Mother Care (KMC) is a standardized, evidence-based protocol designed for the care of preterm and low-birth-weight (LBW) infants. According to the WHO, KMC consists of three main pillars: **Skin-to-skin contact**, **Exclusive breastfeeding**, and **Early discharge with regular follow-up**. **Why "Free nutritional supplements" is the correct answer:** While KMC aims to improve the nutritional status of the neonate, it does so through the promotion of **exclusive breastfeeding**. Providing "free nutritional supplements" (like formula or artificial fortifiers) is not a defined component of the KMC protocol. In fact, KMC specifically discourages pre-lacteal feeds and artificial supplements to ensure the immunological and nutritional benefits of breast milk. **Analysis of Incorrect Options:** * **Skin-to-skin contact (KMC Position):** This is the hallmark of KMC. The infant is placed vertically between the mother's breasts, providing continuous warmth (thermal regulation) and colonizing the infant with maternal flora. * **Exclusive breastfeeding (KMC Nutrition):** KMC promotes early and exclusive breastfeeding to boost immunity and weight gain. * **Early discharge and follow-up:** KMC allows stable LBW infants to be discharged earlier than those in conventional incubator care, provided there is a robust follow-up system to monitor growth and health. **High-Yield Clinical Pearls for NEET-PG:** * **Eligibility:** KMC can be started for all stable LBW infants. For unstable infants, "Partial KMC" can be initiated during brief periods of stability. * **Minimum Duration:** To be effective, KMC should be practiced for at least **one hour** at a time (to avoid frequent handling stress). Ideally, it should be practiced 24 hours a day. * **Benefits:** It reduces the risk of neonatal sepsis, hypothermia, and hypoglycemia, while improving maternal-infant bonding. * **Termination:** KMC is usually continued until the baby reaches **40 weeks of post-menstrual age** or a weight of **2500g**, or when the baby starts wriggling out of the position.

Question 180: What is the most common cause of neonatal seizures?

A. Sepsis
B. Hypoxic ischemic encephalopathy (Correct Answer)
C. Bacterial meningitis
D. Hypoglycemia

Explanation: **Explanation:** **Hypoxic Ischemic Encephalopathy (HIE)** is the most common cause of neonatal seizures, accounting for approximately **50–60%** of all cases. It typically manifests within the first 24 hours of life (usually peaking between 12–24 hours). The underlying mechanism involves birth asphyxia leading to ATP depletion, failure of the Na+/K+ ATPase pump, and subsequent neuronal depolarization and excitotoxicity. **Analysis of Incorrect Options:** * **Sepsis and Bacterial Meningitis:** While these are critical causes to rule out, they are less frequent than HIE. Seizures due to meningitis usually appear later in the first week (3–7 days). * **Hypoglycemia:** This is a common **metabolic** cause, but it is statistically less frequent than HIE. Metabolic disturbances (including hypocalcemia) are often secondary to HIE or other systemic stressors. **High-Yield Clinical Pearls for NEET-PG:** * **Timing is Key:** Seizures in the first 24 hours are most likely HIE. Seizures occurring after 72 hours are more likely due to infections or metabolic disorders. * **Drug of Choice:** **Phenobarbital** remains the first-line anticonvulsant for neonatal seizures (Loading dose: 20 mg/kg). Levetiracetam is increasingly used as an alternative. * **Subtle Seizures:** These are the **most common type** of seizures in both term and preterm neonates (e.g., rowing, pedaling, eye blinking, or apnea). * **Benign Familial Neonatal Seizures:** Caused by mutations in potassium channel genes (**KCNQ2, KCNQ3**).

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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