The anterior fontanelle closes by:

ESIC Nursing Officer -2019 (Shift -1)

Child Health Nursing (Pediatrics)

Easy

Appeared in: ESIC Nursing Officer -2019 (Shift -1)

Explanation

The anterior fontanelle is the larger, diamond-shaped soft spot on the front of an infant's skull.
Its closure is a normal developmental milestone that typically occurs between 9 and 18 months of age.
This extended period allows for the rapid brain growth that happens during the first year and a half of life.
The average time of closure is around 18 months, as confirmed by multiple pediatric and nursing textbooks.

Option A: Closure at 2-3 years of age is considered delayed closure. It is abnormal and may indicate underlying medical conditions.
Option B: Fontanelles are open at birth. This is essential to allow the baby's head to mold and pass through the birth canal and to accommodate brain growth after birth.
Option C: Closure by 2 months of age is characteristic of the posterior fontanelle, not the anterior one.

Visual 1: Diagram - A superior view of an infant's skull, clearly labeling the diamond-shaped anterior fontanelle and the triangular posterior fontanelle, along with the sutures. This helps visualize the anatomical locations.
Visual 2: Infographic - A chart comparing the key features of the anterior and posterior fontanelles, including shape, size, and average closure time.
Visual 3: Clinical Photos - Images showing a normal fontanelle, a sunken fontanelle (indicating dehydration), and a bulging fontanelle (indicating increased intracranial pressure) to help with clinical assessment.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pediatric developmental milestones: Fontanelle closure time as background academic context rather than a clinical decision trigger.
Assessing the fontanelles is a critical part of the newborn and infant physical examination for nurses. It provides vital clues about hydration status and intracranial pressure.
A sunken or depressed fontanelle can be a sign of dehydration, requiring prompt fluid replacement. A bulging or tense fontanelle is a red flag for increased intracranial pressure (e.g., from meningitis, hydrocephalus, or hemorrhage) and is a medical emergency.
Nurses should educate parents about the normal feel of the soft spot and advise them to report any significant changes, such as bulging or sinking, immediately.

How to Approach the Question

This is a factual recall question about pediatric developmental milestones.
First, identify the key term in the question: 'anterior fontanelle'.
Recall the two main fontanelles (anterior and posterior) and their distinct characteristics from your nursing knowledge.
Differentiate their closure times. Remember that the posterior fontanelle is smaller and closes very early (around 2-3 months), while the larger anterior fontanelle stays open much longer to accommodate brain growth.
Scan the options to find the timeframe that matches the closure of the anterior fontanelle.
Select the option that states '9 to 18 months', as this is the standard accepted range.

Concept Tested & Keywords

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