DSSSB 13 August 2024: At what age is it possible for an infant to control its head?

DSSSB 13 August 2024

Child Health Nursing (Pediatrics)

Easy

Appeared in: DSSSB 13 August 2024

Explanation

By 3 months (12 weeks), an infant's neck and upper body muscles are strong enough to lift their head and chest off a surface when lying prone, often bearing weight on the forearms.
When pulled to a sitting position, there is only minimal head lag, which is a key indicator of developing neuromuscular control.
In a ventral suspension (held horizontally in the air), a 3-month-old can lift their head above the horizontal plane, demonstrating significant strength against gravity.
This milestone is a fundamental step that allows for greater visual interaction with the environment and precedes other motor skills like sitting.

Option B: At 2 weeks, a newborn has very weak neck muscles and exhibits complete head lag. They can turn their head side to side when lying down but cannot support its weight.
Option C: Similar to 2 weeks, an infant at 3 weeks lacks the necessary muscle strength for head control. Head lag is still complete or very significant.
Option D: At 1 month, an infant may momentarily lift their chin when prone, but the head still flops down during ventral suspension and there is marked head lag when pulled to sit.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infant Gross Motor Development: Head Control as background academic context rather than a clinical decision trigger.
Assessing head control is a crucial part of developmental screening for infants, as it reflects the maturation of the central nervous system.
Significant delay in achieving head control (persistent head lag beyond 4 months) is a 'red flag' that can indicate hypotonia (low muscle tone), cerebral palsy, or other neuromuscular disorders, requiring prompt referral for further evaluation.
Nurses play a key role in educating parents about 'tummy time,' which helps strengthen the neck and upper body muscles necessary for head control and other motor milestones.

How to Approach the Question

Identify the core concept being tested: The question asks for a specific gross motor milestone (head control) and the age at which it is typically achieved.
Recall the general sequence of infant motor development. Development proceeds from head to toe (cephalocaudal), so head control is one of the earliest major motor skills.
Evaluate the given options. Consider that 2 weeks, 3 weeks, and 1 month are very early in an infant's life, a time when they are mostly reflexive and have very little muscle control.
Eliminate the extremely early ages, as significant muscle strength is required for head control.
Select the most plausible age. Three months is a well-established timeframe for significant improvement in head control, where head lag becomes minimal and the infant can actively lift their head.

Concept Tested & Keywords

Concept Tested: Infant Gross Motor Development: Head Control
Stem keywords: infant, control, head
Lead-in keywords: At what age
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 23-25

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 196-198

E6 Nursing Fundamentals Taylor p. 360-362