You may think of your belly button as just a scar from your umbilical cord, but it's actually a bustling hub for bacteria. A ...

Your belly button, or navel – clinically, your umbilicus – is the permanent scar left from where your umbilical cord connected your circulatory system, when you were a fetus, to the placenta.

You may notice an itchy belly button during pregnancy (or itchiness all over your belly) due to stretching or dry skin.

And, Khloé Kardashian has spoken out about the potential for her belly button to change during pregnancy, going so far as to say that she's "freaked out" that her innie will become an outie, so ...

3. But why do some people have outies, anyway? The look of your belly button is not related to the location of the clamp or where your doctor cut the cord.

Katy Perry, who's expecting her first child with actor Orlando Bloom, shared a video of her "outie" belly button on Instagram with fans.

The look of your belly button is not related to the location of the clamp or where your doctor cut the cord. Outies are simply an example of normal human variation, like the way some people have ...