Periumbilical abdominal wall defect is one of the symptoms of umbilical bulge (omphalocele), also known as umbilical hernia, which is due to defective development of the mid-abdomen and periumbilical abdominal wall in the embryo at 6 to lO weeks, with defective skin, muscle and fascia, resulting in delayed disappearance or even non-appearance of the fetal physiological midgut hernia, with the abdominal contents protruding outside the abdominal wall inside the umbilical cord and covering the peritoneum and amniotic membrane on the surface. Umbilical hernia is divided into the following types: 1. Amniotic hernia Amniotic oil is also known as umbilical bulge or umbilical cord hernia. This is a malformation in which the abdominal viscera prolapse out of the body due to congenital abdominal wall dysplasia and defects occurring around the umbilicus. The clinical manifestation is a protruding extra-abdominal abdominal apparatus in the center of the abdomen of the newborn, equivalent to the umbilical cord, covered with a transparent capsule through which the internal organs can be seen. There are umbilical cord remnants attached to the capsule, especially the umbilical artery, which is particularly prominent. The interior of the capsule contains the small intestine, and sometimes part of the stomach, liver and spleen may also be displaced within the capsule. According to the size of the abdominal wall defect can be divided into small, large umbilical bulge and associated deformities. 2, infant umbilical hernia Infant umbilical hernia occurs mostly in infants under the age of I. Huge is rare. The causes of umbilical hernia in infants and young children are twofold ☆ the developmental abnormalities of the umbilicus, including the umbilical ring is not closed or the umbilical ring is closed but the formation of umbilical hernia due to weak local short scar tissue; on the other hand, there are various reasons for the increase of intra-flag pressure. 3.Adult umbilical hernia Adult umbilical hernia is mostly seen in obese people with weak abdominal wall, middle-aged and old people and menstruating mothers, and also in patients with chronic diseases with increased intra-abdominal pressure, accounting for t% of all types of cancer. 4%. Adult umbilical hernia is an acquired disease, mostly caused by pregnancy, ascites, abdominal tumor, obesity and other reasons, resulting in thin connective tissue of the umbilical ring and reduced ability to resist abdominal pressure, sometimes accompanied by leaving the rectus abdominis muscle.