You can rub the belly for umbilical hernia.

An umbilical hernia is a hernia that protrudes through the navel, known as an umbilical hernia, which is more common in infants. Infant umbilical hernias tend to heal on their own, and most do not require surgical treatment. Adult umbilical hernias are more often related to increased abdominal pressure. Most infant umbilical hernias are due to congenital developmental defects, where the umbilical ring does not completely close, or the scar tissue at the navel is weak and not strong enough. Under conditions of increased abdominal pressure, the internal organs can protrude through the navel to form a hernia.