The top of the baby’s skull is made up of several bones connected by flexible membranes.
These membranes or fontanelles can be seen as ‘soft spots’ on top of the baby’s head and their purpose is to enable the bones to move and slide over each other so the head becomes moulded as it moves down the birth canal.

Regardless of size the head will mould.

Vaginal babies often have cone shaped heads when they are born because of this bone movement

Caesarean babies heads are usually much rounder because they haven’t come through the birth canal.