Developmental and Behavioral Pediatrics — MCQs

Developmental and Behavioral Pediatrics Indian Medical PG Practice Questions and MCQs

Question 41: All of the following statements are true about Rett's syndrome except:

A. Loss of acquired motor skills between 5 to 48 months
B. Language impairment is a symptom
C. Poorly coordinated gait is commonly seen
D. Is more common in males (Correct Answer)

Explanation: **Explanation:** Rett Syndrome is a unique neurodevelopmental disorder that primarily affects **females**. The correct answer is **D** because the condition is almost exclusively seen in girls; in males, the mutation is typically lethal in utero, leading to miscarriage or neonatal death. **Why Option D is the Correct (False) Statement:** Rett Syndrome is caused by a mutation in the **MECP2 gene** located on the **X chromosome**. Since females have two X chromosomes, they can survive with one mutated copy (due to X-inactivation), whereas hemizygous males (XY) lack a functional copy, resulting in severe encephalopathy or prenatal lethality. **Analysis of Other Options:** * **Option A:** A hallmark of Rett Syndrome is a period of normal development followed by **regression**. Loss of acquired purposeful hand skills and motor milestones typically occurs between **5 to 48 months** of age. * **Option B:** Significant **language impairment** and loss of social engagement (often mimicking autism in the early stages) are core clinical features. * **Option C:** As the disease progresses, neurological stability declines, leading to **ataxia** and a **poorly coordinated gait** or trunk movements. **High-Yield Clinical Pearls for NEET-PG:** * **Hand Stereotypies:** The most characteristic sign is repetitive, "hand-washing" or "hand-wringing" movements. * **Head Growth:** Deceleration of head growth (acquired microcephaly) is a key diagnostic criterion. * **Stages:** It progresses through four stages: Early onset, Rapid destruction, Plateau, and Late motor deterioration. * **Mnemonic:** Think of **"Rett = Regression + wRinging hands + girls."**

Question 42: Which among the following is the most common cause of temper tantrum?

A. Autism
B. Bad parenting (Correct Answer)
C. ADHD
D. Behavioral problems

Explanation: ### Explanation **Correct Option: B. Bad parenting** **Medical Concept:** Temper tantrums are a normal part of behavioral development in children aged **18 months to 4 years**. They occur because the child’s cognitive and emotional desires exceed their verbal ability to express them. While tantrums are developmentally expected, the **most common cause** for persistent, frequent, or severe tantrums is **inconsistent or "bad" parenting**. This includes lack of clear boundaries, over-permissiveness, or reinforcing negative behavior by giving in to the child’s demands. When a child learns that a tantrum results in getting what they want, the behavior is reinforced through operant conditioning. **Analysis of Incorrect Options:** * **A. Autism:** While children with Autism Spectrum Disorder (ASD) often have "meltdowns" due to sensory overload or difficulty with transitions, it is a neurodevelopmental disorder and not the *most common* cause of tantrums in the general pediatric population. * **C. ADHD:** Children with ADHD may exhibit impulsivity and low frustration tolerance, leading to outbursts. However, ADHD is a specific clinical diagnosis, whereas most tantrums are behavioral/environmental in origin. * **D. Behavioral problems:** This is a broad, non-specific category. A temper tantrum is itself a behavioral manifestation; "bad parenting" is the underlying etiology or trigger for the persistence of this behavior. **Clinical Pearls for NEET-PG:** * **Peak Age:** Temper tantrums are most common between **2 and 3 years** of age (the "Terrible Twos"). * **Management:** The gold standard management is **"Planned Ignoring"** (extinction). Parents should ensure the child is safe but must not provide attention or rewards during the episode. * **Red Flags:** Tantrums lasting >15 minutes, occurring >5 times a day, or involving self-harm/injury to others may indicate underlying psychiatric issues. * **Breath-holding spells:** These are often triggered by temper tantrums or sudden frustration.

Question 43: A 3-year-old girl with normal developmental milestones, except for delayed speech onset at four years old, shows a lack of peer interaction and a preference for routine in eating, playing, and sleeping. She experiences temper tantrums when faced with changes. What is the likely diagnosis?

A. Attention Deficit Hyperactivity Disorder (ADHD)
B. Autism Spectrum Disorder (Correct Answer)
C. Specific Learning Disorder
D. Intellectual Disability

Explanation: ### Explanation The clinical presentation of this 3-year-old girl is classic for **Autism Spectrum Disorder (ASD)**. The diagnosis is based on a triad of core deficits: 1. **Impaired Social Interaction:** Lack of peer interaction and social-emotional reciprocity. 2. **Communication Deficits:** Delayed speech onset (though the question mentions 4 years, the symptoms are manifesting currently). 3. **Restricted, Repetitive Patterns:** A pathological insistence on sameness (routine in eating/sleeping) and emotional dysregulation (tantrums) when these routines are disrupted. #### Why the other options are incorrect: * **ADHD:** Characterized by inattention, hyperactivity, and impulsivity. While children with ADHD may have social friction, they do not typically exhibit the profound lack of social interest or the rigid insistence on routines seen here. * **Specific Learning Disorder:** This diagnosis involves difficulties in specific academic areas (reading, writing, or math) and is usually diagnosed once the child reaches formal school age. It does not explain social withdrawal or behavioral rigidity. * **Intellectual Disability (ID):** While ID can co-occur with ASD, the question states the child had "normal developmental milestones" otherwise. ID involves global delays across cognitive and adaptive domains, not just social and language-specific deficits. #### High-Yield Clinical Pearls for NEET-PG: * **M-CHAT-R:** The most commonly used screening tool for ASD in toddlers (16–30 months). * **Early Signs:** Lack of joint attention (not pointing to show interest) and failure to respond to their name by 12 months. * **Prognosis:** The best predictors of long-term functional outcome in ASD are **level of intelligence (IQ)** and **communicative language development** by age 5. * **Management:** Primarily behavioral therapy (Applied Behavior Analysis - ABA). Pharmacotherapy (e.g., Risperidone) is reserved only for severe irritability or aggression.

Question 44: All of the following are preschool age problems EXCEPT:

A. Sleeping disorder
B. Temper tantrum (Correct Answer)
C. Pica
D. Stuttering

Explanation: **Explanation:** The **preschool age** typically refers to children aged **3 to 6 years**. To answer this question, one must distinguish between behaviors normal for toddlers (1–3 years) and those characteristic of the preschool period. **Why "Temper Tantrum" is the correct answer:** Temper tantrums are considered a hallmark of the **toddler age group (1–3 years)**, peaking around 18–24 months. They occur because toddlers have limited verbal skills to express frustration and are transitioning toward autonomy. By the preschool age (3–6 years), children have developed better language skills and emotional regulation; therefore, persistent temper tantrums at this stage are often considered a behavioral concern rather than a normal developmental phase. **Analysis of Incorrect Options:** * **Sleeping Disorders:** These are very common in preschoolers (3–6 years), specifically **night terrors** and **nightmares**. This is the age when a child’s imagination develops, leading to fears of the dark or monsters. * **Pica:** While it can start earlier, pica (eating non-nutritive substances) is frequently diagnosed or persists into the preschool years. It is often associated with iron or zinc deficiency or emotional deprivation. * **Stuttering (Normal Disfluency):** Between ages 3 and 4, many children experience "developmental stuttering" as their thought processes outpace their motor speech abilities. It is a classic preschool-age concern. **NEET-PG High-Yield Pearls:** * **Breath-holding spells:** Most common between 6 months and 2 years (Toddler). * **Thumb sucking:** Considered normal until age 4; if it persists beyond age 5, it may cause dental malocclusion. * **Enuresis:** Diagnosis is only made after age 5 (Preschool/School age). * **Night Terrors:** Occur during NREM sleep (Stage 4); the child has no memory of the event.

Question 45: Early strict toilet training can result in which of the following?

A. Nocturnal enuresis
B. Encopresis (Correct Answer)
C. Night terror
D. Temper tantrums

Explanation: **Explanation:** **Why Encopresis is the Correct Answer:** Toilet training is a significant developmental milestone usually initiated between 18–24 months when the child achieves physiological readiness (sphincter control). **Early or overly strict toilet training** often leads to a "battle of wills" between the parent and child. This psychological stress causes the child to intentionally withhold stool to exert control or avoid punishment. Chronic withholding leads to fecal impaction, loss of rectal sensation, and eventually **overflow incontinence**, known as **Encopresis**. In this context, it is considered a functional constipation-related disorder triggered by coercive behavioral interventions. **Analysis of Incorrect Options:** * **A. Nocturnal Enuresis:** This is involuntary voiding of urine during sleep in children >5 years. While it can have psychological components, it is more commonly linked to genetics, ADH secretion patterns, or small bladder capacity rather than strict toilet training. * **C. Night Terrors:** These are parasomnias occurring during NREM sleep (Stage 3/4). They are related to CNS immaturity and are not directly caused by toilet training methods. * **D. Temper Tantrums:** While strict training might trigger a tantrum in the moment, tantrums are a normal part of the "Toddler" phase (1–3 years) as children struggle with autonomy. Encopresis is the specific clinical sequela of toilet training conflict. **Clinical Pearls for NEET-PG:** * **Readiness Signs:** The child should be able to walk to the potty, stay dry for 2 hours, and follow simple commands before training begins. * **Encopresis Definition:** Repeated passage of feces into inappropriate places (involuntary or intentional) in a child at least **4 years** of age. * **Primary vs. Secondary:** Primary encopresis means the child never achieved fecal continence; Secondary means it developed after a period of continence.

Question 46: Which of the following is a preventable cause of mental retardation?

A. Down syndrome
B. Phenylketonuria
C. Cretinism (Correct Answer)
D. Cerebral palsy

Explanation: **Explanation:** **Cretinism (Congenital Hypothyroidism)** is the correct answer because it is the **most common preventable cause of intellectual disability (mental retardation) worldwide.** The underlying medical concept is that thyroid hormones are critical for fetal and neonatal brain development, specifically for neuronal migration, myelination, and synaptogenesis. If diagnosed early through **newborn screening** and treated promptly with Levothyroxine (ideally within the first 2 weeks of life), the neurodevelopmental damage can be entirely prevented, allowing the child to achieve a normal IQ. **Analysis of Incorrect Options:** * **Down Syndrome (Option A):** This is a chromosomal anomaly (Trisomy 21). While it can be screened for prenatally, it is a genetic condition that cannot be "prevented" or reversed once conception has occurred. * **Phenylketonuria (Option B):** While the intellectual disability associated with PKU can be *managed* or mitigated through a strict low-phenylalanine diet, it is an inherited metabolic disorder. Cretinism is considered more "preventable" in a public health context, especially in cases caused by maternal iodine deficiency. * **Cerebral Palsy (Option C):** This is a non-progressive motor impairment syndrome caused by an insult to the developing brain (e.g., birth asphyxia). While some causes are avoidable, CP itself is a clinical description of permanent brain damage rather than a specific preventable metabolic or endocrine condition. **Clinical Pearls for NEET-PG:** * **Most common cause of Cretinism:** Thyroid dysgenesis (Ectopy is the most common specific type). * **Early signs:** Prolonged physiological jaundice, large posterior fontanelle, hoarse cry, and umbilical hernia. * **Iodine Deficiency:** The most common cause of preventable mental retardation in specific endemic geographical belts.

Question 47: Which of the following is a preventable cause of mental retardation?

A. Hypothyroidism (Correct Answer)
B. Down syndrome
C. Cerebral palsy
D. All of the above

Explanation: **Explanation:** **1. Why Hypothyroidism is the Correct Answer:** Congenital Hypothyroidism is the **most common preventable cause** of intellectual disability (mental retardation) worldwide. Thyroid hormones are critical for fetal and neonatal brain development, specifically for neuronal migration, myelination, and synaptogenesis. If diagnosed early through **newborn screening** and treated with Levothyroxine within the first 2–4 weeks of life, the neurodevelopmental damage can be entirely prevented, allowing the child to achieve a normal IQ. **2. Why Other Options are Incorrect:** * **Down Syndrome (Trisomy 21):** This is a chromosomal anomaly. While it is the most common genetic cause of intellectual disability, it is **not preventable** once conception has occurred, nor is the cognitive impairment reversible. * **Cerebral Palsy (CP):** CP is a permanent, non-progressive motor impairment caused by an insult to the developing brain (e.g., birth asphyxia). While some causes of CP can be *avoided* through better obstetric care, the condition itself is a permanent structural brain injury that cannot be "cured" or reversed to prevent the associated developmental delays. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of preventable mental retardation:** Iodine deficiency (globally/nutritional) or Congenital Hypothyroidism (clinical). * **Most common inherited cause of mental retardation:** Fragile X Syndrome. * **Most common genetic/chromosomal cause of mental retardation:** Down Syndrome. * **Screening:** The best time to screen for Congenital Hypothyroidism is **after 48–72 hours of birth** to avoid the physiological TSH surge. * **Clinical Sign:** An umbilical hernia, large posterior fontanelle, and prolonged neonatal jaundice are early clues to hypothyroidism.

Question 48: An 8-year-old child presents with enuresis (bedwetting). The parents mention the child had a fall from bed once, but has no other significant medical history. There are no signs of urinary tract infection or neurological deficits. What is the best next step in management?

A. Behavioral modification (Correct Answer)
B. Start desmopressin therapy
C. Order renal ultrasound and voiding cystourethrogram
D. Prescribe oxybutynin

Explanation: ***Behavioral modification*** - **Behavioral modification** is the established first-line management approach for **monosymptomatic nocturnal enuresis (MNE)** in children aged 5 years and older, particularly when underlying organic causes are ruled out. - This includes techniques like **bedwetting alarms** (most effective long-term treatment), motivational therapy, and restricting evening fluid intake. *Start desmopressin therapy* - **Desmopressin (DDAVP)** is the most common pharmacological agent for MNE, used for severe symptoms or situational control (e.g., sleepovers). - However, desmopressin is typically initiated *after* an adequate trial (3-6 months) of **behavioral therapies** has failed, making it a second-line, not first-line, option. *Order renal ultrasound and voiding cystourethrogram* - Imaging studies are **not routinely indicated** in uncomplicated primary MNE without red flags. - These investigations are reserved for cases with **secondary enuresis**, daytime symptoms, recurrent UTIs, abnormal physical findings, or suspected anatomical abnormalities. - The current presentation has no concerning features warranting immediate imaging. *Prescribe oxybutynin* - Oxybutynin is an anticholinergic agent used primarily when enuresis is due to **reduced functional bladder capacity** or **daytime wetting** associated with urgency. - It is typically a **second-line agent** or used only when a full workup identifies specific bladder dynamics issues, following the failure of behavioral therapy.

Question 49: A young boy is brought to the clinic for developmental assessment. On examination, he has a prominent epicanthal fold, a single transverse palmar crease, hypotonia, and intellectual disability. Facial features appear flat with upslanting palpebral fissures. What is the most likely diagnosis?

A. Down syndrome (Correct Answer)
B. Patau syndrome
C. Edward syndrome
D. Fragile X syndrome

Explanation: ***Down syndrome*** (Trisomy 21) is the most likely diagnosis, as the combination of **hypotonia**, **intellectual disability**, **flat facial features**, **upslanting palpebral fissures**, and a **single transverse palmar crease** (Simian crease) are classic findings. The presence of these multiple congenital anomalies suggests a chromosomal abnormality, with Trisomy 21 being the most common cause of intellectual disability associated with these findings. *Patau syndrome* (Trisomy 13) is characterized by severe midline defects such as **cleft lip and palate**, **microphthalmia**, and **polydactyly**, features not mentioned in this presentation. *Edward syndrome* (Trisomy 18) is typically associated with **rocker-bottom feet**, **micrognathia**, and characteristic **clenched hands** with overlapping fingers, making this option less likely. Finally, *Fragile X syndrome* is an X-linked disorder presenting with large ears, a long face, and **macroorchidism** (in post-pubertal males), but lacks the specific facial and palmar crease findings described here.

Question 50: A child presents with features of short stature, muscle weakness, and learning disability. Chromosome analysis reveals a deletion on the long arm of chromosome 15q on the paternal side. What is the most likely diagnosis?

A. Rett syndrome
B. Angelman syndrome
C. Cri du chat syndrome
D. Prader-Willi syndrome (Correct Answer)

Explanation: ***Correct: Prader-Willi syndrome*** - Caused by deletion or loss of function of **paternally inherited genes on chromosome 15q11-q13** - Classic features include **hypotonia, hyperphagia leading to obesity, short stature, hypogonadism, and learning disabilities** - The paternal origin of the deletion is key to diagnosis (genomic imprinting disorder) - Diagnostic criteria: characteristic facial features (almond-shaped eyes, narrow forehead), small hands and feet *Incorrect: Angelman syndrome* - Also involves chromosome 15q11-q13 but from **maternal deletion** (not paternal) - Features: severe intellectual disability, ataxia, happy demeanor with inappropriate laughter, seizures - Different clinical presentation despite same chromosomal region (imprinting disorder) *Incorrect: Rett syndrome* - X-linked dominant disorder caused by **MECP2 gene mutation** on chromosome X (not 15) - Primarily affects females with normal early development followed by regression - Characteristic hand-wringing movements and loss of purposeful hand skills *Incorrect: Cri du chat syndrome* - Caused by deletion on the **short arm of chromosome 5p** (not 15) - Named for characteristic cat-like cry in infancy - Features: microcephaly, wide-set eyes, low-set ears, severe intellectual disability

Practice by Chapter

Normal Development and Variations

Practice Questions

Developmental Delay and Intellectual Disability

Practice Questions

Autism Spectrum Disorders

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Attention Deficit Hyperactivity Disorder

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Learning Disabilities

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Language and Speech Disorders

Practice Questions

Motor Disorders

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Behavioral Problems in Young Children

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Sleep Disorders

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Mood and Anxiety Disorders

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Psychosomatic Disorders

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Developmental Surveillance and Screening

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