Umbilical hernia is a common navel disease in infants and young children, primarily due to developmental defects at the navel where the region is relatively weak. When abdominal pressure increases, the contents of the abdomen may protrude, but this condition is generally not serious and does not cause severe harm to the child, with most cases resolving on their own. Therefore, for babies with an umbilical hernia, it is okay to allow them to swim. Swimming will not exacerbate the hernia nor cause any adverse effects. Only a very few severe cases of umbilical hernia, which have not healed naturally by the age of two, would require surgical treatment. It is also fine for children with an umbilical hernia to swim two to three times a week; parents can be reassured about this.