Why do we have belly buttons?

Your belly button marks the spot where your umbilical (say: um-BIL-ih-kul) cord was once attached. This cord is a soft, bendable tube that nutrients — vitamins and minerals — from your mother to you, back when you were in her belly (womb). An umbilical hernia occurs when part of your intestine bulges through the opening in your abdominal muscles near your belly button (navel). Umbilical hernias are common and typically harmless. Directly behind the navel is a thick fibrous cord formed from the umbilical cord, called the urachus, which originates from the bladder. As you stick your finger into your belly button. Because your spinal cord at that level is also relaying signals from your bladder and urethra. Here's another fun fact: Some people don't have belly buttons. This is usually because they were born with a condition that affected the umbilical cord. Examples include bladder exstrophy, gastroschisis, omphalocele, or cloacal exstrophy.