In infants, you may observe soft spots in the head and these are called fontanelles. They are located in different specific areas and they close at varied times.
The posterior fontanelle is the first to close, usually around 2 to 3 months after the infant's birth. The second would be the sphenoidal fontanelle, closing at 6 months. The third would be the mastoid fontanelle, which closes within 6 to 18 months. Lastly, the anterior fontanelle, which closes around 10 to 24 months after birth.
