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Why do we have a belly button? The belly button, or navel, is a scar left over from the umbilical cord that connected a fetus to its mother's placenta in the uterus. The umbilical cord is the lifeline that provides nutrients and oxygen to the developing fetus, and it also removes waste products. After a baby is born, the umbilical cord is cut, leaving a stump that eventually dries up and falls off. The remaining tissue heals and forms a scar, which is the belly button. The shape and size of the belly button can vary from person to person, depending on factors such as the way the umbilical cord was cut and the healing process. So, in short, we have a belly button because it is the scar that remains after the umbilical cord is cut and healed, and it serves no functional purpose in the human body.