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More About Belly Buttons!

The umbilicus (commonly called a navel, or belly button) is a scar on the abdomen, caused when the umbilical cord is removed from a newborn baby. All placental mammals have a navel. While it is fairly conspicuous in humans, in most mammals it appears only as a thin hairless line.

In humans, the scar can appear as a depression (sometimes colloquially referred to as an "innie") or as a protrusion ("outie"). Although they can easily be separated into 'innie' and 'outie' categories, navels vary quite drastically in terms of size, shape, depth and overall look, between people