In some monsters all the abdominal contents are contained in the hernia.

Infantile umbilical hernia is common, and appears after the separation of the umbilical cord; it is caused by the yielding of the cicatrix in this situation.

It never reaches a large size, and shows a tendency to spontaneous cure.

Adult umbilical hernia rarely commences in infancy.

It is most commonly seen in persons with pendulous bellies, and is sometimes of enormous size, in addition to the ordinary abdominal contents, containing even the stomach and uterus.