What causes the difference between an innie or outie belly button?

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What causes the difference between an innie or outie belly button?

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The most popular explanation is that the difference between innies and outies is due to where the umbilical cord is cut and that extra skin left from the umbilical cord may cause the protrusion of an outie. But it’s really mostly random, as the umbilical cord is always clamped well away from the navel and doesn’t usually affect innie or outie status. The shape of the belly button a person ends up with, however, is determined by how the umbilical cord was attached, not where it was cut.