Developmental and Behavioral Pediatrics Practice Questions

Q: A 15-year-old male child has a mental age of 9 years. What is his IQ?

60. **Explanation:** The Intelligence Quotient (IQ) is a measure used to assess a child's cognitive development relative to their peers. The standard formula to calculate IQ, as developed by William Stern, is: **IQ = (Mental Age / Chronological Age) × 100** In this clinical scenario: * **Mental Age (MA):** 9 years * **Chronological Age (CA):** 15 years * **Calculation:** (9 / 15) × 100 = 0.6 × 100 = **60** Therefore, the child has an IQ of 60, which falls under the category of **Mild Intellectual Disability** (IQ range 50–69). **Analysis of Incorrect Options:** * **Option A (50):** This would require a mental age of 7.5 years (7.5/15 × 100). * **Option C (70):** This would require a mental age of 10.5 years (10.5/15 × 100). 70 is the traditional cutoff for intellectual disability. * **Option D (80):** This would require a mental age of 12 years (12/15 × 100). This falls into the "Low Average" or "Dull Normal" category. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classification of Intellectual Disability (ID):** * **Mild (IQ 50–69):** Educable; can achieve social and vocational adequacy with support. * **Moderate (IQ 35–49):** Trainable; can perform supervised tasks. * **Severe (IQ 20–34):** Can be trained in basic self-care. * **Profound (IQ < 20):** Total dependency. 2. **IQ Stability:** While the formula is useful for children, IQ scores generally stabilize after the age of 16. 3. **Most Common Cause:** The most common genetic cause of intellectual disability is **Down Syndrome**, while the most common inherited cause is **Fragile X Syndrome**.

Q: A 18-month-old baby presents with recurrent episodes of excessive crying followed by cyanosis, unconsciousness, and occasional seizures since 9 months of age. What is the most likely diagnosis?

Breath holding spells. **Explanation:** The clinical presentation of a toddler with episodes triggered by **excessive crying** or frustration, followed by **cyanosis** and brief **unconsciousness**, is classic for **Breath Holding Spells (BHS)**. These are non-epileptic paroxysmal events occurring in children typically aged 6 months to 2 years. The sequence is: Provocation (anger/pain) → Vigorous crying → Expiration → Apnea → Cyanosis → Loss of consciousness. If the apnea is prolonged, generalized hypertonia or brief clonic jerks (reflex anoxic seizures) may occur, which are often confused with epilepsy. **Analysis of Options:** * **Epilepsy (A):** Seizures are usually unprovoked and not preceded by crying. In BHS, the loss of consciousness occurs *after* the crying and apnea, whereas in epilepsy, it is the primary event. * **Anoxic Spells (B):** Also known as "Tet spells," these are seen in Cyanotic Heart Disease (e.g., TOF). While they involve cyanosis, they are usually triggered by feeding or waking up and are associated with a systolic murmur and "squatting" in older children. * **Vasovagal Attack (D):** These are rare in infants and more common in adolescents. They are usually triggered by standing for long periods or medical procedures and present with pallor and diaphoresis rather than cyanotic crying fits. **High-Yield Pearls for NEET-PG:** 1. **Types:** Two types exist—**Cyanotic** (most common, triggered by anger) and **Pallid** (triggered by sudden pain/fright, mediated by the vagus nerve). 2. **Association:** BHS is strongly associated with **Iron Deficiency Anemia**. Treating the anemia often reduces the frequency of spells. 3. **Prognosis:** Excellent; most children outgrow these spells by age 5. 4. **Management:** Reassurance to parents is the mainstay. No anticonvulsants are required.

Q: Memory impairment is most likely to occur in which of the following conditions?

Down syndrome. **Explanation:** **Down Syndrome (Trisomy 21)** is the correct answer because it is characteristically associated with intellectual disability and specific neuroanatomical changes. Individuals with Down syndrome have a significantly smaller **hippocampus** and prefrontal cortex. Since the hippocampus is the primary center for memory consolidation, its reduced volume leads to marked deficits in explicit memory and long-term storage. Furthermore, by age 40, almost all individuals with Down syndrome develop neuropathological changes identical to **Alzheimer’s disease** (amyloid plaques and neurofibrillary tangles), leading to progressive memory decline. **Analysis of Incorrect Options:** * **Alkaptonuria:** This is an autosomal recessive metabolic disorder (deficiency of homogentisate 1,2-dioxygenase). It presents with ochronosis (dark pigmentation), dark urine, and arthritis, but it does not typically affect cognitive function or memory. * **Attention Deficit Disorder (ADD/ADHD):** The primary deficit here is in **executive function and attention**, not memory storage. While a child may "forget" instructions due to lack of focus, the underlying memory apparatus remains intact. * **Conduct Disorder:** This is a behavioral disorder characterized by a repetitive pattern of violating the basic rights of others and societal norms. It is a disorder of social conduct and impulse control, not a cognitive memory impairment. **NEET-PG High-Yield Pearls:** * **APP Gene:** The Gene for Amyloid Precursor Protein (APP) is located on **Chromosome 21**, explaining the early onset of Alzheimer-like dementia in Down syndrome. * **Neurotransmitters:** Down syndrome is associated with a significant decrease in **Choline Acetyltransferase** levels in the cortex and hippocampus. * **Most common cause:** Down syndrome is the most common chromosomal cause of intellectual disability.

Q: Which of the following is not a feature of infant colic syndrome?

Vomiting. **Explanation:** **Infant Colic Syndrome** (also known as evening colic) is a benign, self-limiting condition characterized by paroxysmal episodes of irritability and intense crying in an otherwise healthy, well-fed infant. **Why "Vomiting" is the Correct Answer:** Infant colic is a functional behavioral syndrome, not an organic gastrointestinal disease. The presence of **vomiting** is a "red flag" symptom that suggests an underlying organic pathology such as Gastroesophageal Reflux Disease (GERD), intestinal obstruction (e.g., intussusception), or pyloric stenosis. In true infant colic, the baby remains healthy, gains weight normally, and has no associated systemic symptoms like fever or vomiting. **Analysis of Incorrect Options:** * **Paroxysmal symptoms:** Colic is defined by its sudden onset and cessation. Episodes typically occur in the late afternoon or evening without an obvious trigger. * **Abdominal pain:** During episodes, infants often appear to be in pain; they typically flex their legs over the abdomen, clench their fists, and have a distended, tense abdomen due to swallowed air. * **Continuous severe cry:** The hallmark of colic is a loud, piercing, and inconsolable cry that lasts for hours. **High-Yield Clinical Pearls for NEET-PG:** * **Wessel’s Rule of Three:** Diagnosis is made if crying lasts **>3 hours/day**, occurs **>3 days/week**, for **>3 weeks**. * **Age of Onset:** Usually starts at 2–3 weeks of age, peaks at 6 weeks, and typically resolves by **3–4 months** ("Three-month colic"). * **Management:** Reassurance of parents is the mainstay. Dietary modifications or simethicone drops may be tried, but evidence is limited. Always rule out organic causes if "red flags" (vomiting, poor weight gain) are present.

Q: Which of the following findings is not typically associated with fetal alcohol syndrome?

Macrocephaly. **Explanation:** Fetal Alcohol Syndrome (FAS) is a leading preventable cause of intellectual disability, resulting from maternal alcohol consumption during pregnancy. Ethanol acts as a potent teratogen that interferes with neuronal proliferation, migration, and survival, leading to structural brain abnormalities. **Why Macrocephaly is the Correct Answer:** Alcohol exposure is fundamentally **neurotoxic and inhibitory** to brain growth. It leads to a reduction in brain volume and overall cranial size. Therefore, **Microcephaly** (small head circumference) is a hallmark diagnostic feature of FAS, whereas **Macrocephaly** (enlarged head) is not associated with the syndrome. **Analysis of Other Options:** * **Microcephaly (A):** This is a cardinal feature of FAS. The toxic effects of ethanol result in decreased brain mass and impaired skull growth. * **Holoprosencephaly (C):** Ethanol exposure during early gastrulation can disrupt midline brain development. While severe holoprosencephaly is rare, FAS is a known risk factor for midline defects. * **Thinning of the Corpus Callosum (D):** This is one of the most common neuroanatomical abnormalities seen in FAS. The corpus callosum may be hypoplastic, thinned, or even entirely absent (agenesis). **NEET-PG High-Yield Pearls for FAS:** 1. **Facial Triad:** Short palpebral fissures, smooth philtrum, and thin upper lip (vermilion border). 2. **Growth:** Pre- and post-natal growth retardation (weight and/or height <10th percentile). 3. **Cardiac Defect:** Ventricular Septal Defect (VSD) is the most common associated cardiac anomaly. 4. **Skeletal:** Radioulnar synostosis and hockey-stick palmar crease are classic signs. 5. **Critical Period:** The first trimester is the most critical period for structural malformations, though alcohol affects the CNS throughout all trimesters.

Q: A 2-year-old female child, normal at birth with normal early development, now presents with microcephaly, regression of acquired language and motor milestones, along with abnormal stereotypic hand-wringing movements. What is the most likely diagnosis?

Rett syndrome. **Explanation:** The clinical presentation described is classic for **Rett syndrome**, a neurodevelopmental disorder predominantly affecting females. It is caused by a mutation in the **MECP2 gene** on the X chromosome. **Why Rett Syndrome is correct:** The hallmark of Rett syndrome is a period of **normal early development** (usually 6–18 months) followed by a rapid **regression** in language and motor skills. Key diagnostic features present in this case include: * **Acquired Microcephaly:** Deceleration of head growth is a characteristic early sign. * **Stereotypic Hand Movements:** Purposeful hand use is replaced by repetitive, involuntary movements like **hand-wringing**, clapping, or washing. * **Loss of Milestones:** Regression of speech and gait. **Why the other options are incorrect:** * **Angelman Syndrome:** Characterized by "happy puppet" demeanor (frequent laughter), ataxia, and seizures. While it involves intellectual disability, it lacks the specific regression and hand-wringing pattern of Rett. * **Asperger Syndrome:** Now part of the Autism Spectrum Disorder (ASD) continuum; it involves social challenges and restricted interests but **does not** feature regression of motor milestones or microcephaly. * **Metachromatic Leukodystrophy:** A lysosomal storage disease causing progressive demyelination. While it involves motor regression, it typically presents with upper motor neuron signs (spasticity) and peripheral neuropathy, not stereotypic hand movements. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** X-linked dominant; usually lethal in males (hence seen almost exclusively in females). * **Respiratory pattern:** Patients often exhibit episodes of hyperventilation followed by apnea during wakefulness. * **Seizures:** Common in up to 80% of affected children. * **Scoliosis:** A frequent long-term orthopedic complication.

Q: Which of the following is NOT a characteristic of dyslexia?

Mental retardation. **Explanation:** **Dyslexia** is a specific learning disability characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities. **Why Option A is the correct answer:** The hallmark of dyslexia is that the reading difficulty is **unexpected** in relation to the individual's chronological age and **intellectual ability**. By definition, children with dyslexia have a **normal or even superior Intelligence Quotient (IQ)**. Therefore, mental retardation (Intellectual Disability) is not a characteristic of dyslexia; in fact, an IQ below 70 would generally preclude a primary diagnosis of dyslexia, as the learning struggle would be attributed to global cognitive impairment rather than a specific learning disorder. **Analysis of Incorrect Options:** * **Option B (Inability to interpret written language):** This is a core feature. Dyslexics struggle with phonological processing, making it difficult to bridge the gap between spoken and written symbols. * **Option C (Familial tendency):** Dyslexia has a strong genetic component. Approximately 30-50% of children with an affected parent will also have the condition. * **Option D (Reading retardation):** This is a clinical synonym for the primary symptom of dyslexia, where reading achievement is significantly below the expected level for the child's age and schooling. **NEET-PG High-Yield Pearls:** * **Most common** type of Learning Disability (LD). * **Gender:** More common in boys. * **Clinical Sign:** "Mirror writing" or letter reversals (e.g., confusing 'b' and 'd') are common but not pathognomonic. * **Associated Condition:** High comorbidity with **ADHD**. * **Management:** Multisensory educational interventions (e.g., Orton-Gillingham approach); it is not treated with medication.

Q: Which of the following is not a habit disorder?

Temper tantrum. **Explanation:** In developmental pediatrics, it is crucial to distinguish between **habit disorders** and **behavioral/conduct disorders**. **Why "Temper Tantrum" is the correct answer:** A **Temper Tantrum** is classified as a **behavioral disorder** (specifically an emotional outburst). It is a normal part of development in toddlers (typically ages 1–3 years) used to express frustration or anger due to limited verbal skills. Unlike habits, which are repetitive, often unconscious physical movements, tantrums are episodic, situational, and social manifestations of emotional dysregulation. **Analysis of Incorrect Options:** * **Nail biting (Onychophagia):** This is a classic **habit disorder**. It is a repetitive, body-focused behavior often triggered by anxiety, boredom, or stress. * **Thumb sucking:** This is one of the most common **habit disorders** in early childhood. While normal in infancy, it is considered a habit disorder if it persists beyond the age of 4–5 years, potentially leading to dental malocclusion. * **Tics:** Tics are sudden, rapid, recurrent, non-rhythmic motor movements or vocalizations. They are classified under **habit/movement disorders** (and specifically Tic Disorders in the DSM-5). **NEET-PG High-Yield Pearls:** * **Habit Disorders:** These are repetitive, non-functional patterns of behavior (e.g., thumb sucking, nail biting, hair pulling/trichotillomania, breath-holding spells). * **Temper Tantrums:** Peak incidence is at **18–24 months**. Management involves "anticipatory guidance" and **ignoring the behavior** (extinction) while ensuring the child's safety. * **Breath-holding spells:** These are also considered habit disorders and are often triggered by anger or pain; they are paroxysmal and involuntary. * **Pica:** The persistent ingestion of non-nutritive substances is another common habit disorder frequently tested in Pediatrics.

Q: A child shows head growth decelerating between the ages of 6 months and 1 year. Which of the following is the most likely diagnosis?

Rett syndrome. **Explanation:** The correct answer is **Rett Syndrome**. This is a neurodevelopmental disorder primarily affecting females, caused by a mutation in the **MECP2 gene** on the X chromosome. **Why Rett Syndrome is correct:** Children with Rett syndrome typically exhibit a period of normal development for the first 6 months of life. This is followed by a characteristic **deceleration of head growth** (leading to acquired microcephaly) between 6 months and 4 years of age. Other hallmark features include the loss of purposeful hand skills, the development of stereotypic hand movements (e.g., hand-wringing), and loss of social engagement, which often mimics autism. **Why the other options are incorrect:** * **Down Syndrome:** Microcephaly is often present from birth (congenital) rather than appearing as a deceleration after 6 months. It is characterized by distinct dysmorphic features and trisomy 21. * **Autistic Disorder:** While social impairment is common, autism is not typically associated with a deceleration of head growth. In fact, some children with autism exhibit *macrocephaly* or accelerated head growth in early childhood. * **Learning Disorder:** These are specific impairments in academic skills (reading, writing, math) and do not manifest with physical growth changes like microcephaly. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** X-linked dominant; lethal in most males. * **Key Sign:** Hand-wringing movements are the "classic" board exam clue. * **Stages:** It involves a period of regression followed by a plateau phase. * **Breathing:** Intermittent hyperventilation and apnea are common during wakefulness.

Question 1

A 15-year-old male child has a mental age of 9 years. What is his IQ?

Accepted Answer

60

Answer

50

Answer

70

Answer

80

Question 2

A 18-month-old baby presents with recurrent episodes of excessive crying followed by cyanosis, unconsciousness, and occasional seizures since 9 months of age. What is the most likely diagnosis?

Accepted Answer

Breath holding spells

Answer

Epilepsy

Answer

Anoxic spells

Answer

Vasovagal attack

Question 3

Memory impairment is most likely to occur in which of the following conditions?

Accepted Answer

Down syndrome

Answer

Alkaptonuria

Answer

Attention deficit disorder

Answer

Conduct disorder

Question 4

Which of the following is not a feature of infant colic syndrome?

Accepted Answer

Vomiting

Answer

Paroxysmal symptoms

Answer

Abdominal pain

Answer

Continuous severe cry

Question 5

Which of the following findings is not typically associated with fetal alcohol syndrome?

Accepted Answer

Macrocephaly

Answer

Microcephaly

Answer

Holoprosencephaly

Answer

Thinning of the corpus callosum

Question 6

A 2-year-old female child, normal at birth with normal early development, now presents with microcephaly, regression of acquired language and motor milestones, along with abnormal stereotypic hand-wringing movements. What is the most likely diagnosis?

Accepted Answer

Rett syndrome

Answer

Angelman syndrome

Answer

Asperger syndrome

Answer

Metachromatic leukodystrophy

Question 7

Which of the following is NOT a characteristic of dyslexia?

Accepted Answer

Mental retardation

Answer

Inability to interpret written language

Answer

Familial tendency

Answer

Reading retardation

Question 8

Which of the following is not a habit disorder?

Accepted Answer

Temper tantrum

Answer

Nail biting

Answer

Thumb sucking

Answer

Tics

Question 9

A child shows head growth decelerating between the ages of 6 months and 1 year. Which of the following is the most likely diagnosis?

Accepted Answer

Rett syndrome

Answer

Down syndrome

Answer

Autistic disorder

Answer

Learning disorder

Question 10

A 6-year-old child presents with nocturnal enuresis (bed-wetting at night) but no daytime wetting. Investigations reveal a urine specific gravity of 1.020, with all other tests being normal. What is the most appropriate advice?

Accepted Answer

Referral to a child psychologist

Answer

Reassurance

Answer

Ultrasound abdomen

Answer

CT pelvis

Developmental and Behavioral Pediatrics — MCQs

Developmental and Behavioral Pediatrics — MCQs

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