Growth and Development Practice Questions

Q: A newborn can lose up to what percentage of birth weight in the first week of life?

10%. **Explanation:** The correct answer is **10%**. **Why it is correct:** It is a physiological phenomenon for newborns to lose weight during the first few days of life. This occurs primarily due to the **excretion of excess extravascular fluid** (diuresis), the passage of meconium, and a relatively low caloric intake during the initial phase of breastfeeding. * **Term neonates** typically lose up to **10%** of their birth weight. * **Preterm neonates** may lose even more, typically up to **15%**, due to higher insensible water loss and immature renal function. Most healthy term infants regain their birth weight by **7 to 10 days** of life. **Why other options are incorrect:** * **A (6%):** While some infants may only lose 5-7%, the standard clinical threshold for "normal" physiological weight loss in a term infant is up to 10%. * **C & D (15% and >15%):** A weight loss exceeding 10% in a term neonate is considered **pathological**. It often indicates breastfeeding failure, dehydration, or an underlying systemic illness and requires immediate clinical evaluation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Regaining Weight:** Term infants regain birth weight by **10 days**; Preterm infants by **14 days**. 2. **Weight Doubling:** Birth weight doubles by **5 months**. 3. **Weight Tripling:** Birth weight triples by **1 year**. 4. **Weight Quadrupling:** Birth weight quadruples by **2 years**. 5. **Average Daily Gain:** In the first 3 months, an infant gains approximately **25–30 g/day**.

Q: Which reflex, once lost, never reappears in a normal infant?

Moro's reflex. ### Explanation **Moro’s Reflex (Correct Answer):** Moro’s reflex is a primitive, vestibular-driven reflex present at birth. It typically disappears by **3–4 months** of age as the central nervous system matures and the cerebral cortex exerts inhibitory control over the brainstem. In a neurologically healthy individual, once this reflex is integrated (lost), it **never reappears**. Its persistence beyond 6 months or its reappearance is a definitive sign of upper motor neuron (UMN) lesion or cerebral palsy. **Analysis of Incorrect Options:** * **Grasp Reflex (B):** While the palmar grasp disappears by 2–3 months, it can reappear in adults with **frontal lobe lesions** (frontal release sign). * **Snout Reflex (C):** This is a primitive reflex where tapping the lips causes pouting. It is normally suppressed in adults but reappears in **dementia** (e.g., Alzheimer’s) or diffuse brain damage. * **Glabellar Reflex (D):** Also known as the "Myerson sign," repetitive tapping on the forehead normally leads to habituation (blinking stops). Failure to habituate (persistent blinking) is a clinical marker for **Parkinson’s disease**. **High-Yield Clinical Pearls for NEET-PG:** * **Asymmetrical Moro:** Suggests Erb’s palsy, fractured clavicle, or shoulder dislocation. * **Absent Moro at birth:** Suggests significant CNS depression, hypoxia, or lower motor neuron injury. * **Order of disappearance:** Stepping (1-2m) → Rooting (3-4m) → Moro (3-4m) → Palmar Grasp (3m) → Plantar Grasp (9-12m). * **Parachute Reflex:** This is a protective reflex that appears at **6–9 months** and, unlike primitive reflexes, **persists throughout life**.

Q: All of the following are features of Ehlers-Danlos syndrome except?

Long stature. **Explanation:** **Ehlers-Danlos Syndrome (EDS)** is a heterogeneous group of inherited connective tissue disorders characterized by defects in **collagen synthesis**. The primary clinical triad includes skin hyperextensibility, joint hypermobility, and tissue fragility. **Why "Long Stature" is the correct answer:** Long stature (marfanoid habitus) is a hallmark of **Marfan Syndrome** and **Homocystinuria**, not Ehlers-Danlos Syndrome. While both EDS and Marfan syndrome involve connective tissue defects and joint laxity, EDS patients typically have a normal stature. **Analysis of Incorrect Options:** * **Blue Sclera:** This is a classic feature of EDS (especially the Kyphoscoliotic type) and Osteogenesis Imperfecta. It occurs because the thinning of the collagen in the sclera allows the underlying choroidal veins to show through. * **Subluxation of Lens (Ectopia Lentis):** While more common in Marfan syndrome, lens subluxation can occur in certain types of EDS due to weakness in the ciliary zonules. * **Epicanthal Folds:** These are common dysmorphic facial features associated with several types of EDS, along with a broad nasal bridge. **NEET-PG High-Yield Pearls:** * **Gorlin Sign:** The ability to touch the tip of the nose with the tongue (seen in 50% of EDS patients). * **Beighton Score:** Used to quantify systemic joint hypermobility. * **Vascular EDS (Type IV):** Caused by a mutation in **COL3A1**; it is the most severe form due to the risk of spontaneous arterial or organ rupture. * **Cigarette Paper Scars:** Thin, atrophic scars resulting from poor wound healing in EDS.

Q: Talon's cusp is characteristic of which syndrome?

Rubinstein-Taybi syndrome. **Explanation:** **Talon’s Cusp** is a rare dental anomaly characterized by an accessory cusp-like structure projecting from the cingulum or cementoenamel junction of maxillary or mandibular incisors. It resembles an eagle's talon, hence the name. 1. **Why Rubinstein-Taybi Syndrome (RTS) is correct:** Rubinstein-Taybi syndrome is a multisystem genetic disorder (mutations in *CREBBP* or *EP300* genes) characterized by intellectual disability, broad thumbs, and great toes. **Talon’s cusp** is a highly specific dental finding in RTS, occurring in approximately 73% of affected individuals. It is considered a diagnostic hallmark in the field of pediatric dentistry and clinical genetics for this syndrome. 2. **Why other options are incorrect:** * **Edward’s Syndrome (Trisomy 18):** Characterized by micrognathia, low-set ears, rocker-bottom feet, and clenched fists with overlapping fingers. It does not have a specific association with Talon’s cusp. * **Klinefelter’s Syndrome (47, XXY):** Associated with **taurodontism** (enlarged pulp chambers), but not typically with Talon’s cusp. * **Down’s Syndrome (Trisomy 21):** Common dental findings include hypodontia (missing teeth), microdontia, and delayed eruption, but Talon’s cusp is not a characteristic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Maxillary lateral incisor (permanent dentition). * **Composition:** It contains normal enamel, dentin, and varying degrees of pulp tissue (important for clinical management/shaving). * **Rubinstein-Taybi Triad:** Broad thumbs/toes, facial dysmorphism (beaked nose), and intellectual disability. * **Differential Diagnosis:** Do not confuse Talon's cusp with **Dens evaginatus**, which typically occurs on the occlusal surface of premolars.

Q: At what age is a baby typically considered to be reliably 'bed-dry'?

5 years. **Explanation:** The correct answer is **5 years**. In pediatrics, nocturnal bladder control is a developmental milestone that is typically the last to be achieved (following bowel control and daytime bladder control). **1. Why 5 years is correct:** Clinically, **Enuresis** (bed-wetting) is defined as the involuntary discharge of urine at night in a child aged **5 years or older**. Before this age, occasional bed-wetting is considered developmentally normal due to the ongoing maturation of the nervous system, bladder capacity, and the circadian rhythm of antidiuretic hormone (ADH) secretion. By age 5, approximately 85-90% of children have achieved reliable nighttime dryness. **2. Analysis of Incorrect Options:** * **3 years:** At this age, most children are achieving daytime dryness, but nighttime control is still inconsistent. * **4 years:** While many children are dry by 4, it is not the diagnostic threshold. A 4-year-old wetting the bed is not yet classified as having a medical condition (Enuresis). * **6 years:** While some children take longer, the standard medical and psychiatric (DSM-5) definition uses 5 years as the benchmark for "reliable" dryness. **3. NEET-PG High-Yield Pearls:** * **Sequence of Control:** 1. Nocturnal Bowel → 2. Daytime Bowel → 3. Daytime Bladder → 4. **Nocturnal Bladder** (Last to be achieved). * **Primary vs. Secondary Enuresis:** Primary means the child has never been dry for >6 months; Secondary means bed-wetting recurred after a period of dryness (often due to stress or UTI). * **Management:** The most effective long-term treatment is the **Enuresis Alarm** (conditioning therapy). The first-line pharmacological treatment is **Desmopressin** (ADH analogue). * **Rule of Thumb:** 15% of 5-year-olds wet the bed; this prevalence decreases by about 15% each year thereafter.

Q: A 40-week-old infant can do all of the following except:

Makes a tower of 3-4 cubes. This question tests the knowledge of developmental milestones in an infant. A **40-week-old infant** is approximately **9 to 10 months old**. ### **Why Option D is Correct** **Making a tower of 3–4 cubes** is a fine motor milestone typically achieved at **18 months**. * At 12 months, an infant can only attempt to stack two cubes or successfully place one on top of another. * Building a tower of 2 cubes occurs at 15 months. * Building a tower of 3–4 cubes requires advanced precision and hand-eye coordination not present at 40 weeks. ### **Analysis of Incorrect Options** * **A. Waves bye-bye:** This is a social milestone achieved by **9 months**. Since the infant is 40 weeks (approx. 9.2 months), they should be able to perform this gesture. * **B. Transfers objects:** This is a fine motor milestone achieved by **6 months**. By 40 weeks, this skill is well-established. * **C. Sits without support:** This is a gross motor milestone achieved by **8 months**. A 40-week-old infant can sit steadily and is usually progressing toward pulling themselves to a standing position (9 months). ### **NEET-PG Clinical Pearls: Cube Milestones** To quickly solve "cube" questions, remember this high-yield sequence: * **12–15 months:** Tower of 2 cubes * **18 months:** Tower of 3–4 cubes * **24 months (2 years):** Tower of 6 cubes * **36 months (3 years):** Tower of 9 cubes or a Bridge * **48 months (4 years):** Gate * **60 months (5 years):** Steps/Staircase

Q: Which of the following is NOT seen in fetal alcohol syndrome?

Overgrowth of body. **Explanation:** Fetal Alcohol Syndrome (FAS) is a leading preventable cause of intellectual disability, resulting from maternal alcohol consumption during pregnancy. The hallmark of FAS is **Growth Restriction**, not overgrowth. **1. Why "Overgrowth of body" is the correct answer:** Alcohol acts as a potent teratogen that interferes with cellular proliferation and protein synthesis. This leads to **Prenatal and Postnatal Growth Retardation**. Affected infants are typically "Small for Gestational Age" (SGA) and continue to have low weight and height percentiles throughout childhood. Therefore, overgrowth is clinically inconsistent with FAS. **2. Analysis of Incorrect Options:** * **Microcephaly (A):** Alcohol is neurotoxic to the developing brain, leading to reduced brain volume and a characteristically small head circumference. * **Poor coordination (B):** Damage to the cerebellum and basal ganglia results in neurological deficits, including impaired fine motor skills, poor coordination, and delayed milestones. * **Flat face (D):** FAS is characterized by specific midface hypoplasia. Key facial dysmorphism includes a **flat nasal bridge**, **smooth philtrum** (loss of the vertical groove above the lip), and a **thin upper lip (vermilion border)**. **High-Yield Clinical Pearls for NEET-PG:** * **Facial Triad of FAS:** Short palpebral fissures, smooth philtrum, and thin upper lip. * **Cardiac Defects:** Most common is **Ventricular Septal Defect (VSD)**. * **Critical Period:** The first trimester is the most critical period for structural malformations, though alcohol affects the brain throughout all trimesters. * **Diagnosis:** Requires documentation of the three facial features, growth retardation, and CNS abnormalities.

Q: Infantile cortical hyperostosis is:

Caffey disease.. **Explanation:** **Infantile Cortical Hyperostosis**, also known as **Caffey disease**, is a rare, self-limiting inflammatory disorder characterized by a clinical triad of **fever, soft-tissue swelling, and irritability**, typically occurring within the first six months of life. The hallmark radiographic finding is subperiosteal new bone formation (hyperostosis), most commonly affecting the **mandible** (75-80% of cases), followed by the clavicles and long bones. **Analysis of Options:** * **Option A (Correct):** Caffey disease is the eponymous name for Infantile Cortical Hyperostosis. It is often associated with mutations in the *COL1A1* gene. * **Option B (Incorrect):** **Cherubism** is a genetic disorder (SH3BP2 mutation) characterized by bilateral, painless, cystic expansion of the jaws (mandible and maxilla), giving the child a "cherubic" appearance. It typically appears later in childhood (2–7 years). * **Option C (Incorrect):** **Marfan syndrome** is a connective tissue disorder (FBN1 mutation) characterized by tall stature, arachnodactyly, ectopia lentis, and aortic root dilation. It does not involve cortical hyperostosis. * **Option D (Incorrect):** **Garre’s Osteomyelitis** (Chronic Non-suppurative Sclerosing Osteomyelitis) is a peripheral induced reactive bone formation due to low-grade infection or irritation, usually localized to a single tooth or area in the mandible. **High-Yield Clinical Pearls for NEET-PG:** * **Most common bone involved:** Mandible (Differential diagnosis: Vitamin A toxicity, which spares the mandible). * **Laboratory findings:** Elevated ESR and Alkaline Phosphatase (ALP). * **Management:** Usually self-limiting; symptoms resolve spontaneously within months. NSAIDs or steroids may be used for symptomatic relief. * **Key Radiographic Sign:** "Onion-skin" appearance of the periosteum (though less specific than in Ewing sarcoma).

Q: Which of the following developmental milestones is typically NOT achieved by a 3-year-old child?

Drawing a triangle. **Explanation:** Developmental milestones are a high-yield topic in NEET-PG, bridging Anatomy (Neuroanatomy) and Pediatrics. The correct answer is **A (Drawing a triangle)** because this is a fine motor skill typically achieved at **5 years** of age, not 3. **Why the correct answer is right:** Fine motor development follows a predictable sequence of complexity. At age 3, a child can copy a circle. By age 4, they can copy a cross or a square. The **triangle** requires advanced finger-thumb coordination and the ability to execute diagonal strokes, which usually matures by age 5. **Analysis of incorrect options:** * **B. Drawing a circle:** This is a hallmark fine motor milestone for a **3-year-old**. It follows the "scribbling" (18 months) and "vertical line" (2 years) stages. * **C. Ascending and descending stairs independently:** By **3 years**, a child can go up stairs using alternating feet. While they may still use two feet per step when descending, the general ability to navigate stairs independently is established. * **D. Building a tower of 9 cubes:** A useful formula for cube towers is **Age in years × 3**. Therefore, a 3-year-old can build a tower of 9 cubes (3x3=9). (Note: 2 years = 6 cubes; 18 months = 3 cubes). **Clinical Pearls for NEET-PG:** * **Handedness:** Usually determined by **2–3 years** of age. * **Riding a Tricycle:** A classic gross motor milestone for a **3-year-old**. * **Social Milestone:** A 3-year-old knows their age and gender and can share toys. * **Language:** A 3-year-old speaks in sentences of 3–4 words and can be understood by strangers.

Question 1

A newborn can lose up to what percentage of birth weight in the first week of life?

Accepted Answer

10%

Answer

6%

Answer

15%

Answer

>15%

Question 2

Which reflex, once lost, never reappears in a normal infant?

Accepted Answer

Moro's reflex

Answer

Grasp reflex

Answer

Snout reflex

Answer

Glabellar reflex

Question 3

All of the following are features of Ehlers-Danlos syndrome except?

Accepted Answer

Long stature

Answer

Blue sclera

Answer

Subluxation of lens

Answer

Epicanthal folds

Question 4

Talon's cusp is characteristic of which syndrome?

Accepted Answer

Rubinstein-Taybi syndrome

Answer

Edward's syndrome

Answer

Klinefelter's syndrome

Answer

Down's syndrome

Question 5

At what age is a baby typically considered to be reliably 'bed-dry'?

Accepted Answer

5 years

Answer

3 years

Answer

4 years

Answer

6 years

Question 6

A 40-week-old infant can do all of the following except:

Accepted Answer

Makes a tower of 3-4 cubes

Answer

Waves bye-bye

Answer

Transfers objects from one hand to another

Answer

Sits without support

Question 7

Which of the following is NOT seen in fetal alcohol syndrome?

Accepted Answer

Overgrowth of body

Answer

Microcephaly

Answer

Poor coordination

Answer

Flat face

Question 8

Infantile cortical hyperostosis is:

Accepted Answer

Caffey disease.

Answer

Cherubism.

Answer

Marfan syndrome.

Answer

Garre's osteomyelitis.

Question 9

Arrange the following milestones in ascending order of appearance (starting from earliest to later milestones):

Accepted Answer

D - A - C - B

Answer

D - C - A - B

Answer

A - C - D - B

Answer

A - D - C - B

Question 10

Which of the following developmental milestones is typically NOT achieved by a 3-year-old child?

Accepted Answer

Drawing a triangle

Answer

Drawing a circle

Answer

Ascending and descending stairs independently

Answer

Building a tower of 9 cubes

Growth and Development — MCQs

Growth and Development — MCQs

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