Umbilical hernia in infants is caused by congenital development of the umbilical area and weak abdominal muscles, leading to protrusion of the umbilicus. This protrusion is more likely to occur when the child cries intensely, has digestive issues, or experiences increased pressure in the gastrointestinal tract. The majority of umbilical hernias heal on their own as the child ages; small hernial rings may heal within a few months, and about 80% of slightly larger hernias heal by the age of two. However, a small number of children with umbilical hernias, especially those with a hernial ring diameter greater than 2 cm, usually cannot heal on their own. Generally, if a noticeable umbilical hernia still exists after the age of two, surgical treatment may be necessary, though no special treatment is typically needed before that.