Final answer:
The coronal suture running side to side over the top of the skull near the front typically closes in the first two or three months after birth.
Step-by-step explanation:
The suture running side to side over the top of the skull near the front is known as the coronal suture. This suture joins the frontal bone to the right and left parietal bones. The closure or fusion of this suture typically occurs in the first two or three months after birth, with the anterior fontanelle closing by nine to 18 months after birth. The closure of the suture allows the skull bones to fuse together, resulting in a normal head shape and size.