Umbilical dysmorphology. The importance of contemplating the belly button.

Characteristic abnormalities of the umbilicus have been noted in children with Aarskog syndrome, Reiger syndrome, and Robinow syndrome. These observations indicate that specific umbilical configurations may be characteristic features of some malformation syndromes. Evaluation of the umbilicus for minor anomalies should be included in the examination of a dysmorphic child.