system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Anterior fontanelle closes at ____________
assistant
The correct answer is  The posterior fontanelle generally closes 2 to 3 months after bih; The sphenoidal fontanelle is the next toclose around 6 months after bih; The mastoid fontanelle closes next from 6 to 18 months after bih; and. The anterior fontanelle is generally the last to close between 10-24 months. Ref : Nelson paediatrics Chapter : Growth and development