Infant umbilical hernia is caused by congenital underdevelopment of the navel, typically protruding during intense, prolonged crying or increased gastrointestinal gas, which raises abdominal pressure. No special treatment is needed, and heat application is also unnecessary and ineffective. Over 80% of infant umbilical hernias gradually narrow and even close naturally as the child ages and grows physically. Only a small portion of children who still have significant umbilical hernias after the age of two, or those with a hernia ring diameter greater than 2cm, have a low likelihood of natural healing. In these cases, surgical intervention is required.