This illustration shows cranial differences between two newborn infants— one born vaginally (on the right) and the other via cesarean section (on the left.) The cranium of the infant on the left has not been affected by the c-section delivery. During the tight squeeze of vaginal birth, however, the infant on the right has had movement of the cranial bones. The occipital bone at the base of the posterior cranium has been pushed downward, and the parietal bones, which form the “roof” of the head, have been pushed up. When the bilateral parietal bones are pushed up, they sort of “peak” down the sagittal plane of the head. This is why newborn babies’ heads often have a pointy appearance for the first few weeks of life.