Umbilical hernia in infants is caused by congenital underdevelopment of the abdominal muscles, forming a bulge beneath the skin due to abdominal distension protruding from the umbilicus. In fact, it usually does not require special treatment. Most umbilical hernias will gradually narrow and shrink within the first year after birth as the infant's nutrition and physique improve and the abdominal muscles develop, typically leading to natural closure with a very good prognosis. In daily care, it is important to prevent the child from crying loudly, especially when the child has gastrointestinal diseases and increased intestinal gas, which should be actively treated to minimize the herniation and to reduce it back when it does protrude. With such care, the chances of natural healing increase. However, if the child is over four years old and the hernia sac is still relatively large, surgical repair might be necessary.