Historically, a dolichocephalic (elongated) head shape was the norm. Currently the norm has changed to a more brachycephalic (shorter and broader) shape. Since the American Academy of Pediatrics ...

Head growth of the fetus and infant is largely determined by brain growth. The brain reaches 90% of adult size by 1 year of age; it is 95% of its ultimate adult size by 6 years of age and growth ...