Parents of new babies may expect that pediatricians will check their baby's length and weight. But they may not expect that doctors will pull out a tape measure to check the size of a new baby's head.

Children born with macrocephaly have an unusually large head. The circumference will be larger than the 97% of infants of the same age and sex. A doctor will monitor the infant, as there may sometimes ...

- an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical ...