Umbilical hernia is a developmental defect that is common in infants and decreases with age, rarely extending into the school years. It is two to three times more common in girls than in boys. An umbilical hernia is a round or oval, confined mass in the umbilicus. The mass disappears when the child is quiet and in the recumbent position, but protrudes when the intra-abdominal pressure is increased by crying, standing upright, coughing or movement, etc. The higher the intra-abdominal pressure, the more tense the mass becomes. The higher the intra-abdominal pressure, the more tense the mass. If the protruding part is compressed with the end of the finger, the umbilical hernia is easily incorporated into the abdominal cavity and sometimes the sound of air passing through water can be heard. The edge of the umbilical ring can be clearly palpated and its diameter can be estimated by probing into the umbilical hole with the end of the finger. When the child coughs or cries, the end of the finger feels a distinct impact. Children with umbilical hernia are usually painless and do not cause gastrointestinal dysfunction. Individual children may experience localized distension and discomfort. Umbilical hernias rarely become ingrown, which is very different from inguinal hernias. The majority of umbilical hernias in infants heal spontaneously. As the abdominal muscles develop with age, the hernia hole can often be gradually narrowed and closed, usually between 1 and 2 years of age, and can even be expected to heal spontaneously by 3 to 4 years of age. The size of the umbilical ring is related to the possibility of self-healing: in general, umbilical holes with a diameter of about 1 cm can close on their own without any treatment. However, if the umbilical ring is more than 2 cm, especially if it tends to increase in size, it is less likely to heal on its own. The treatment routine for umbilical hernia is to leave it untreated for the time being under 2 years old; over 2 years old. For small umbilical hernia, conservative treatment can be tried for 3-6 months; if it does not close, surgical treatment is performed; for umbilical ring diameter greater than 2 cm, early repair surgery is recommended.