Differences in the size of the umbilical cord and the healing process after the umbilical cord is cut can lead to a large belly button. A wide, flat navel is sometimes also referred to as an amniotic navel. A long bulging navel stump is also known as a flesh navel. A flesh navel should not be confused with an umbilical hernia. If the umbilical cord’s opening does not close tightly, an umbilical hernia can occur. Tissue from the abdominal cavity can get caught in it.