1, giant umbilical bulge The diameter of the defective ring of the abdominal wall is more than 5 cm, sometimes up to 10 cm or more, the diameter of the bulging part is often larger, can be protruding in the center of the abdomen such as bun-like swelling, the umbilical cord is attached to the top of the capsule. After birth, the organs inside the sac can be seen through the transparent membrane, and the contents of the sac include liver, spleen, pancreas and even bladder, in addition to small intestine and colon. 6-8 h later, due to lack of blood supply to the sac wall and exposure to air, the sac membrane becomes cloudy and edematous and thickens. 2-3 days later, it becomes dry, fragile, ruptured and even necrotic. Rupture of the cyst wall can lead to infection of the abdominal cavity and prolapse of the internal organs of the cyst, which can cause death of the child in severe cases, so it should be treated promptly at an early stage. In about 1% of children, the cystic membrane ruptures before or during labor, resulting in the prolapse of the internal organs. Once the cystic membrane is ruptured in utero, the prolapsed organs are immersed in amniotic fluid for a long time, and the intestinal wall is edematous, thickened, lusterless, and covered with inflammatory exudate, with many meconium-colored fibrin on the surface, and the abdominal cavity is infected secondary to mortality. If the cystic membrane is ruptured at the time of delivery, the viscera and intestinal canal are brighter red in color and not covered with yellow fibrin, and the child can be saved by emergency treatment. Although the time of rupture of the cystic membrane varies, residual cystic membrane can be found in all. The skin at the base of the cystic membrane can crawl along the surface of the cystic membrane and eventually form connective tissue under the cystic membrane scab to cover the surface of the cystic membrane. The skin is susceptible to infection at the junction with the cystic membrane and can spread to the abdominal cavity. 2, small umbilical bulge The diameter of the abdominal wall defect ring is less than 5 cm, protruding in the center of the abdomen as an orange, or even olive-like mass, because the diameter of the bulging part is often larger than the abdominal wall defect ring, so the central abdomen can be formed with a tip-like object. Most of the contents of the sac are only small intestine, sometimes transverse colon. During delivery and delivery, if the umbilicus is found to be enlarged, it should be ligated above the umbilical cord to prevent ligating the intestine in it and causing intestinal necrosis. The diagnosis can be clarified based on clinical symptoms and signs.