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What is the most uncommon belly button?

Published in Human Anatomy 1 min read

The most uncommon type of belly button is an outie.

While the vast majority of people have an innie belly button, forming a small indentation or 'belly button hole', a much smaller percentage of the population have belly buttons that protrude outward, known as outies.

Types of Belly Buttons

Here's a breakdown of belly button types based on the reference material:

Belly Button Type Description Prevalence (Approx.)
Innie Belly button that curves inward. ~90%
Outie Belly button that protrudes outward. ~10%
In-Between/Mixed Belly button that is neither fully innie or outie. Very rare


The reference highlights that approximately 90% of people have innies, and a smaller 10% are outies. The mention of "something in between, or even a little of both" suggests that there are variations or mixed types of belly buttons, but these are considered rare. Therefore, outies are statistically the most uncommon of the broadly defined belly button categories.

  • Most people have innies.
  • Outies are significantly less common.
  • Mixed-type belly buttons exist but are considered a rare variant.

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