When the intestines, fat, or body fluids are squeezed out from the weak spot or defect of the abdominal wall muscles of infant, a lump protrudes near the navel, causing the na-vel to bulge, and umbilical hernia will occur.
Many children have umbilical hernia at birth. This is because the area around the umbil-ical cord (umbilical ring) is not completely closed and the muscle structure around the umbilical cord is not fully developed. In general, umbilical hernia is not painful or dan-gerous. If the gap is not large, the chance of self-healing is very high. Generally, before six years of age, the umbilical gap of hernia is within 1 cm and usually closes by itself. It is not necessary to have surgery.