Which of the following is the ideal age for closure of the anterior fontanel of a child?

AIIMS Patna NO - 2020

Pediatric Nursing

Easy

Appeared in: AIIMS Patna NO - 2020

Explanation

The anterior fontanel is the larger, diamond-shaped soft spot on the front of an infant's skull.
Its primary function is to allow for the rapid growth of the brain during the first year of life and to permit molding of the head during childbirth.
The normal time frame for the closure of the anterior fontanel is between 12 to 18 months, with 15-18 months being the ideal range.
The average time of closure is cited as 18 months.

Option B: This timeframe is too early for the closure of the anterior fontanel. Early closure can be a sign of craniosynostosis, a condition where the skull bones fuse prematurely, which can restrict brain growth.
Option C: This is the correct time frame for the closure of the posterior fontanel, not the anterior one. The posterior fontanel is smaller, triangular, and located at the back of the head.
Option D: 18 to 24 weeks is equivalent to approximately 4.5 to 6 months. This is too early for the anterior fontanel to close. Normal closure begins around 9-12 months and is typically complete by 18 months.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal developmental milestones: Fontanel closure time as background academic context rather than a clinical decision trigger.
Assessing fontanels is a critical part of the routine pediatric physical examination. It provides valuable information about hydration status and intracranial pressure.
A sunken or depressed fontanel can be a sign of dehydration, while a tense or bulging fontanel in a resting infant can indicate increased intracranial pressure (e.g., from hydrocephalus or meningitis).
Nurses must accurately measure and document head circumference at each well-child visit to monitor for abnormalities in brain growth, which are often related to fontanel and suture status.

How to Approach the Question

First, identify the key terms in the question: 'anterior fontanel' and 'ideal age for closure'.
This is a factual recall question that tests your knowledge of normal infant developmental milestones.
Recall the distinct closure times for the two main fontanels. The anterior fontanel is larger and closes much later than the posterior one.
Mentally differentiate the closure time for the anterior fontanel (later, around 1.5 years) from the posterior fontanel (earlier, around 2 months).
Evaluate the given options against your recalled knowledge. '15 to 18 months' aligns with the known timeframe for anterior fontanel closure.
Be cautious of distractors that provide the correct timing for the posterior fontanel ('6 to 8 weeks').

Concept Tested & Keywords

Concept Tested: Normal developmental milestones: Fontanel closure time
Stem keywords: anterior fontanel, closure, ideal age, child
Lead-in keywords: Which of the following
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false

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