While we may not pay much attention to our belly buttons (thanks to the demise of the Britney Spears naval piercing era), we all know what we’ve got – but we may not know why they differ from person to person.

Some sport a deep, “innie” style button, while others might have a convex “outie” style which protrudes outwards from the stomach.

Why do you have an innie or an outie?

“A belly button is simply the area which marks where the umbilical cord was connected to your body while you were in your mother’s womb,” says Dr. Diana Gall, MD, GP at Doctor4U, a confidential online doctor service.

She adds: “Once a child is born the umbilical cord is clamped and cut, leaving a small part of the umbilical cord left attached to the child’s stomach. Over the next couple of weeks, the umbilical cord will dry and eventually fall off. What will be left in its place is a belly button.”

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