Expected time of closure of anterior fontanelle is–

Correct option is D

Sol. The anterior fontanelle, located at the junction of the frontal and parietal bones, is the largest soft spot on a newborn’s head. It remains open to accommodate rapid brain growth in the first year of life and usually closes by 16–18 months. Delayed closure may indicate hydrocephalus or rickets, while early closure can suggest craniosynostosis. Routine pediatric checkups monitor fontanelle size and closure.
Explanation of each option:
· (a) 4–6 weeks – Too early; this is usually the closure period of the posterior fontanelle, not anterior.
· (b) 6–8 weeks – Posterior fontanelle closes around this time, but the anterior fontanelle stays open for much longer.
· (c) 9–12 weeks – Anterior fontanelle closure at this time would be premature and might suggest abnormal development.
· (d) 16–18 weeks – Correct Answer. Refers to months, not weeks. Normal closure of anterior fontanelle occurs between 12–18 months, ensuring brain growth.