An umbilical hernia is a condition in which a defect or hole exists in the abdominal wall at the level of the umbilicus. It occurs when part of the intestine protrudes through a weak spot in the abdominal muscles. Umbilical hernias are most common in infants, but they can affect adults as well.
In some babies, there is a significant congenital weakness in this area and the normal closure does not occur. When this happens, the pressure of crying and straining on the abdominal contents makes the umbilicus pooch outward. The hernia thus created is filled with a loop of small intestine, however there is absolutely no danger of entrapment as with an inguinal hernia.

Symptoms

An umbilical hernia creates a soft swelling or bulge near the navel. The bulge may range from 1 to 5 centimeters in diameter
 

Treatment

These hernias are harmless, and generally disappear by two to four years of age. They are more common in African-American children. If the hernia is excessively large, it may be surgically repaired.