Infant umbilical hernia is caused by a weak abdominal wall around the navel, which is underdeveloped, leading to protrusion. This is prone to happen when intra-abdominal pressure is high. Therefore, it's usually sufficient to avoid intense crying in children and actively treat gastrointestinal diseases without special treatment. This is because 80% of infants will naturally see the hernia ring narrow, or even close by itself by the age of two, leading to healing. Only a few children, if the hernia ring diameter is large, more than 2 cm, or if the umbilical hernia is still evident after the child turns two, will require surgical treatment.