Growth and Development Practice Questions

Q: Mr. and Mrs. Annadurai have a 2-month-old baby with Down syndrome. The karyotype of Mrs. Annadurai shows a translocation variety of Down syndrome. Which of the following investigations would you advise to the parents before their next pregnancy?

Karyotyping. **Explanation:** The correct answer is **Karyotyping (Option C)**. In this scenario, the mother is a known carrier of a **translocation** variety of Down syndrome (most commonly Robertsonian translocation involving chromosomes 14 and 21). Unlike Trisomy 21 caused by non-disjunction (which is related to maternal age), translocation Down syndrome is often inherited. **Why Karyotyping is correct:** To assess the recurrence risk for future pregnancies, it is essential to perform **karyotyping of the father**. If the father also carries a balanced translocation, the risk of having another child with Down syndrome increases significantly. For example, if a mother carries a 14;21 translocation, the recurrence risk is ~10-15%; if the father carries it, the risk is ~1-2%. If one parent carries a 21;21 translocation, the recurrence risk is 100%. **Why other options are incorrect:** * **Options A, B, and D (Triple test, AFP, and P-hCG):** These are **screening tests** performed *during* a pregnancy (typically between 15-20 weeks) to assess the risk of chromosomal abnormalities or neural tube defects in the fetus. They do not provide information about the parents' genetic status or the baseline recurrence risk *before* conception. **Clinical Pearls for NEET-PG:** * **Most common cause of Down Syndrome:** Meiotic Non-disjunction (95%), associated with advanced maternal age. * **Translocation Down Syndrome:** Accounts for ~3-4% of cases; it is independent of maternal age. * **Recurrence Risk:** In non-disjunction, the risk is ~1%. In translocation, it depends on the parental carrier status. * **Mosaicism:** Accounts for ~1-2% of cases and usually presents with a milder phenotype.

Q: All of the following are 'red flag signs' for development EXCEPT?

Standing with support - 9 months. ### Explanation In developmental pediatrics, **'Red Flag Signs'** are defined as the upper limit of the age by which a specific milestone must be achieved. If a child fails to reach these milestones by these specific ages, it warrants immediate evaluation for developmental delay. **1. Why Option A is the Correct Answer:** Standing with support at **9 months** is a **normal developmental milestone**, not a red flag. The actual red flag for "standing with support" is **12 months**. Since the question asks for the "EXCEPT" (the one that is not a red flag), this is the correct choice. **2. Analysis of Incorrect Options (Red Flags):** * **Waves bye-bye (12 months):** This is a social/language milestone. Failure to wave or use gestures by 12 months is a red flag for social-communication delay or Autism Spectrum Disorder. * **Single words (16 months):** A child should typically speak their first word with meaning by 12 months. If there are no single words by **16 months**, it is a red flag for language delay. * **Walking without support (18 months):** While most children walk by 12–15 months, the absolute upper limit (red flag) is **18 months**. Beyond this, it may indicate motor delay or Duchenne Muscular Dystrophy. **Clinical Pearls for NEET-PG:** * **Hand preference:** Development of hand preference before **18 months** is a red flag (suggests spasticity/weakness in the other hand). * **Social Smile:** Should appear by **2 months** (Red flag: >3 months). * **Head Control:** Should be achieved by **3 months** (Red flag: >5 months). * **Sitting without support:** Should be achieved by **6-8 months** (Red flag: >9 months).

Q: Birth weight of a newborn baby doubles by which age?

5 months. **Explanation:** The correct answer is **5 months**. In pediatric growth monitoring, weight is one of the most sensitive indicators of a child's nutritional status and general health. According to standard growth patterns (Nelson’s Textbook of Pediatrics), a healthy term neonate typically follows a predictable trajectory: 1. **Correct Option (B):** A newborn baby is expected to **double** their birth weight by **5 months** of age. While older textbooks sometimes cited 6 months, current clinical standards and the WHO growth charts recognize 5 months as the milestone for doubling. 2. **Incorrect Options (A, C, D):** * **4 months:** This is too early for the average infant to double their weight. * **6 months:** While widely taught in the past, 5 months is now the preferred answer for competitive exams like NEET-PG. * **7 months:** This indicates a potential growth delay or "failure to thrive" if the weight hasn't doubled by this point. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Weight Loss:** Newborns lose about **5–10%** of their birth weight in the first week of life due to the excretion of excess extravascular fluid and low intake. They typically regain their birth weight by **day 10–14**. * **Weight Tripling:** Birth weight **triples** by **1 year** (12 months). * **Weight Quadrupling:** Birth weight **quadruples** by **2 years** (24 months). * **Formula for Weight Calculation (Weech’s Formula):** * 3–12 months: (Age in months + 9) / 2 * 1–6 years: (Age in years × 2) + 8 * 7–12 years: [ (Age in years × 7) – 5 ] / 2

Q: Which of the following developmental milestones is NOT typically achieved by 13 months of age?

Casting. **Explanation:** The correct answer is **Casting**, as it is a milestone typically achieved between **15 to 18 months** of age. Casting refers to the deliberate action of throwing objects onto the floor, which signifies a child’s developing understanding of cause-and-effect and spatial relationships. **Why Casting is the correct choice:** While a 12-to-13-month-old can release an object into a container (voluntary release), the sophisticated motor coordination required to "cast" or throw objects purposefully develops later. In the context of NEET-PG, milestones at 12–13 months focus on the transition from infancy to toddlerhood, where casting is still an emerging skill. **Analysis of Incorrect Options:** * **A. Using index finger to point:** This is a fine motor/social milestone achieved by **9–10 months** (pincer grasp and index finger pointing). By 13 months, it is well-established. * **B. Walking independently:** Most children achieve independent walking (broad-based gait) by **12–13 months**. While the range is 9–15 months, it is a hallmark milestone for a 1-year-old. * **C. Saying single words:** By **12 months**, a child typically has 1–3 clear words with meaning (e.g., "Mama," "Dada"). **High-Yield Clinical Pearls for NEET-PG:** * **Tower of Blocks:** 15 months (2 blocks), 18 months (3 blocks), 2 years (6 blocks), 3 years (9 blocks or bridge). * **Social Milestone:** "Bye-bye" and "Pat-a-cake" are achieved by 9–10 months. * **Red Flag:** If a child is not walking by 18 months, it warrants a developmental evaluation.

Q: Which of the following is considered a red flag sign in a child's development if not attained?

Social smile at 6 months. ### Explanation **Correct Answer: D. Social smile at 6 months** In pediatric development, a **"Red Flag"** is the failure to achieve a specific milestone by the upper limit of the normal age range. While most milestones have a wide window of attainment, certain delays are highly sensitive indicators of neurodevelopmental disorders or sensory impairments. * **Social Smile:** This is one of the earliest social milestones. A child normally develops a social smile by **2 months** of age. If a child has not attained a social smile by **6 months**, it is a significant red flag, often associated with visual impairment, attachment issues, or early signs of Autism Spectrum Disorder (ASD). **Analysis of Incorrect Options:** * **A. Vocalization at 2 months:** Cooing and vocalization typically begin around 2 months. Failing to do so at exactly 2 months is not a red flag; the red flag for lack of vocalization/babbling is usually set at **6 months**. * **B. Walking at 12 months:** The average age for independent walking is 12–13 months, but the "red flag" limit is **18 months**. Many healthy children do not walk at 12 months. * **C. Single word at 12 months:** While many children say "Mama/Dada" specifically by 12 months, the red flag for failing to use single words with meaning is **16 months**. **High-Yield Clinical Pearls for NEET-PG:** * **Social Smile:** 2 months (Red flag: 6 months). * **Head Control:** 3 months (Red flag: 6 months). * **Sitting without support:** 6–8 months (Red flag: 9–10 months). * **Standing alone:** 10–12 months (Red flag: 14 months). * **Hand Preference:** Should not appear before **18 months**. Early handedness may indicate spastic hemiplegia in the opposite limb.

Q: Short stature is defined as a height below which percentile?

3rd centile. **Explanation:** **Short stature** is defined as a height that is more than **2 Standard Deviations (SD) below the mean** for age and sex, or **below the 3rd percentile** on a standardized growth chart. 1. **Why the 3rd percentile is correct:** In a normal (Gaussian) distribution of height, 95% of the population falls between -2 SD and +2 SD. The area below -2 SD corresponds approximately to the lowest 3rd percentile. Children falling below this threshold require clinical evaluation to differentiate between normal variants (like Constitutional Delay or Familial Short Stature) and pathological causes (like Growth Hormone deficiency or Turner syndrome). 2. **Why other options are incorrect:** * **5th percentile:** While some screening programs use the 5th percentile to identify children "at risk," it is not the formal diagnostic cutoff for short stature. * **15th and 25th percentiles:** These are well within the normal range of height distribution and do not signify growth failure. **High-Yield Clinical Pearls for NEET-PG:** * **Growth Velocity:** This is the most sensitive indicator of growth. A height velocity **<4 cm/year** between age 5 and puberty is considered pathological, even if the child is currently above the 3rd percentile. * **Bone Age:** In **Constitutional Delay**, bone age is delayed (matches height age); in **Familial Short Stature**, bone age is normal (matches chronological age). * **Mid-Parental Height (MPH):** * *Boys:* [Father's height + Mother's height + 13 cm] / 2 * *Girls:* [Father's height + Mother's height - 13 cm] / 2 * **Upper Segment:Lower Segment (US:LS) Ratio:** At birth, it is 1.7:1; at 3 years, it is 1.3:1; and it reaches **1:1 at 7–10 years**.

Q: Which X-ray view is used to determine bone age in a 3-year-old child?

Wrist. **Explanation:** Bone age is a crucial clinical indicator used to assess a child's skeletal maturity and biological age. The choice of the anatomical site for X-ray depends primarily on the child's chronological age. **Why Wrist is Correct:** For children **older than 1 year**, the standard method for determining bone age is an X-ray of the **Left Hand and Wrist** (Non-dominant hand). This is because the hand and wrist contain a large number of ossification centers (8 carpal bones, metacarpals, and phalanges) that appear and fuse in a predictable chronological sequence. The most commonly used reference is the **Greulich and Pyle Atlas**. **Why the other options are incorrect:** * **Knee (A):** The knee (and foot/ankle) is used for bone age assessment in **infants (0–1 year)**. At birth, the distal femoral and proximal tibial epiphyses are typically present, making the knee a sensitive site for neonatal maturity. * **Shoulder (C):** The shoulder is not a standard site for routine bone age assessment as it lacks the density of small ossification centers found in the hand. * **Ankle (D):** Similar to the knee, the ankle/foot is used primarily in **infants less than 1 year old** to observe the appearance of the talus, calcaneum, and cuboid. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Site:** Left Hand and Wrist (to avoid bias from dominant hand usage/trauma). * **Infants (<1 year):** Use X-ray of the Knee or Foot/Ankle. * **At Birth:** Only two carpal bones (none) are present; however, the **Distal Femoral Epiphysis** (appears at 36 weeks gestation) is a marker of fetal maturity. * **First Carpal Bone to Ossify:** Capitate (at ~1-3 months). * **Last Carpal Bone to Ossify:** Pisiform (at ~9-12 years). * **Tanner-Whitehouse (TW2) Method:** A more complex but accurate "point-scoring" system for bone age.

Q: A mother is worried about green stains on the recently erupted upper anterior teeth of her child. What is the most probable cause of these stains?

Chromogenic bacteria. **Explanation:** The presence of green stains on the recently erupted teeth of a child is most commonly attributed to **Chromogenic bacteria** (Option A). These stains are extrinsic in nature and are caused by the interaction between bacterial metabolic byproducts and the oral environment. **1. Why Chromogenic Bacteria is Correct:** Specific bacteria, most notably *Actinomyces*, *Aspergillus*, and *Penicillium* species, produce color-producing (chromogenic) substances. These bacteria often colonize the dental plaque or the remains of the **Nasmyth’s membrane** (the primary enamel cuticle). The green color specifically results from the decomposition of hemoglobin into biliverdin or the action of fluorescent bacteria. These stains are typically found on the labial surfaces of the maxillary anterior teeth and are associated with poor oral hygiene. **2. Why Other Options are Incorrect:** * **Neonatal line (Option B):** This is a microscopic landmark in the enamel and dentin representing the physiological stress of birth. It is not visible as an extrinsic surface stain. * **Calculus (Option C):** While calculus can be pigmented, it is rare in very young children with recently erupted teeth. It is a hard, mineralized deposit rather than a soft green stain. * **Materia alba (Option D):** This is a soft, white/yellowish accumulation of bacteria, salivary proteins, and food debris. It lacks the distinct green pigmentation characteristic of chromogenic bacterial activity. **High-Yield Clinical Pearls for NEET-PG:** * **Black Stains:** Often associated with *Actinomyces* species and a **lower** incidence of dental caries due to the presence of ferric salts. * **Orange/Red Stains:** Usually caused by *Serratia marcescens* or *Flavobacterium lutescens*. * **Management:** These stains are extrinsic and can be removed by professional scaling and polishing; they do not indicate underlying tooth decay.

Q: A mother of a 5-year-old boy is concerned he is too tall for his age and seeks medical evaluation. On examination, his height is 108 cm and the upper to lower segment ratio is 1.2:1. What would be your advice to the mother?

Reassure parents. **Explanation:** The correct answer is **Reassure parents** because the child’s growth parameters are within the normal physiological range for his age. 1. **Height:** The average height of a child at birth is 50 cm. It increases to 75 cm at 1 year and doubles (100 cm) at 4 years. By age 5, the average height is approximately 108–110 cm. This child’s height of 108 cm is perfectly normal. 2. **Upper Segment to Lower Segment (US:LS) Ratio:** This ratio changes with age as the limbs grow faster than the trunk. * At birth: 1.7:1 * At 3 years: 1.3:1 * **At 5 years: 1.2:1** (Matches the child in the question) * At 7–10 years: 1:1 (Adult ratio) Since both the height and the US:LS ratio are appropriate for a 5-year-old, no further investigation is required. **Analysis of Incorrect Options:** * **Option A (Karyotyping):** Indicated for suspected chromosomal anomalies (e.g., Klinefelter syndrome), which typically present with tall stature and a decreased US:LS ratio (long legs) post-puberty. * **Option C & D (Marfan/Homocystinuria):** These conditions present with "pathological" tall stature and a **decreased US:LS ratio** (<1.0) due to dolichostenomelia (long limbs). Since this child’s ratio is normal for his age, these are ruled out. **NEET-PG High-Yield Pearls:** * **Height Rule of Thumb:** 100 cm at 4 years; 10 cm increase between 4–5 years; then 5–6 cm/year until puberty. * **US:LS Ratio:** Measured from the symphysis pubis. A ratio **higher** than normal for age suggests short-limb dwarfism (e.g., Achondroplasia/Hypothyroidism); a **lower** ratio suggests long-limb syndromes (e.g., Marfan).

Question 1

Mr. and Mrs. Annadurai have a 2-month-old baby with Down syndrome. The karyotype of Mrs. Annadurai shows a translocation variety of Down syndrome. Which of the following investigations would you advise to the parents before their next pregnancy?

Accepted Answer

Karyotyping

Answer

Triple test

Answer

Alpha-fetoprotein

Answer

P-human chorionic gonadotropin

Question 2

All of the following are 'red flag signs' for development EXCEPT?

Accepted Answer

Standing with support - 9 months

Answer

Waves bye bye - 12 months

Answer

Single words - 16 months

Answer

Walking without support - 18 months

Question 3

Birth weight of a newborn baby doubles by which age?

Accepted Answer

5 months

Answer

4 months

Answer

6 months

Answer

7 months

Question 4

Which of the following developmental milestones is NOT typically achieved by 13 months of age?

Accepted Answer

Casting

Answer

Using index finger to point

Answer

Walking independently

Answer

Saying single words

Question 5

Which of the following is considered a red flag sign in a child's development if not attained?

Accepted Answer

Social smile at 6 months

Answer

Vocalization at 2 months

Answer

Walking at 12 months

Answer

Single word at 12 months

Question 6

Short stature is defined as a height below which percentile?

Accepted Answer

3rd centile

Answer

5th centile

Answer

15th centile

Answer

25th centile

Question 7

Which X-ray view is used to determine bone age in a 3-year-old child?

Accepted Answer

Wrist

Answer

Knee

Answer

Shoulder

Answer

Ankle

Question 8

A mother brings her 3-year-old female child complaining that the child is not eating. Her weight is 11 kg (50th percentile) and height is 88 cm (75th percentile). What should be done next?

Accepted Answer

Reassure the parent and take no active measures.

Answer

Administer a vitamin-rich tonic.

Answer

Initiate forceful feeding.

Answer

Conduct a complete investigation for a urinary tract infection.

Question 9

A mother is worried about green stains on the recently erupted upper anterior teeth of her child. What is the most probable cause of these stains?

Accepted Answer

Chromogenic bacteria

Answer

Neonatal line

Answer

Calculus

Answer

Material alba

Question 10

A mother of a 5-year-old boy is concerned he is too tall for his age and seeks medical evaluation. On examination, his height is 108 cm and the upper to lower segment ratio is 1.2:1. What would be your advice to the mother?

Accepted Answer

Reassure parents

Answer

Order for karyotyping

Answer

Perform echocardiography to rule out Marfan syndrome

Answer

Refer for ophthalmological examination and homocysteine level testing

Growth and Development — MCQs

Growth and Development — MCQs

On this page

Practice by Chapter

Want unlimited practice?