Remember Kyle XY, who doesn't have a belly button at all? Yeah, that's physically impossible, except for people who are born on different planets with potentially no actual parents. So why does your belly button do the thing it does?
Most people think that how a doctor clamps the umbilical cord plays an integral part in whether you form an innie or an outie. But that's actually not the case. After the umbilical cord is cut, it dries up and falls off, leaving the belly button in its place.
The umbilical cord dries falls off in a few days after birth because of the lack of nutrients — once you're born, you don't need it anymore. The cord contains arteries and veins, and when the cord is cut it closes up. The veins join together when the cord is cut, seamlessly leaving your belly button where the umbilical cord used to be.
While the scar forms after the umbilical cord falls off, it depends on how the tissue attaches to the underlying muscles. The amount of fat under the skin and the looseness of the skin also plays a factor. Sometimes, if the abdomen expands, there's a chance the the belly button will pop out and become an outie. An umbilical hernia, which happens when fat pushes up through the stomach muscles in the newborn, may also cause an outie belly button. This is no uncommon, and not dangerous or painful.
Roughly 10 to 20 percent of the population have outtie belly buttons, or just not completely innie belly buttons, which calls for the rough estimate. So it's likely that you're an innie. It's the most common formation when the scar is healing.
There is actually an ideal belly button shape. A study at the University of Missouri determined that a small and vertical belly button was the most attractive. It was also deemed that having an attractive belly button may make you more attractive to a mate.
Yes, people do go under the knife to change the appearance of their belly button. The surgery is called umbilicoplasty, and the popularity of the surgery is going way up. It's most common to have the surgery to change an outtie to an innie.
When women are pregnant, it's possible that if they have an innie, it can pop out to an outie. But it's very likely that it will return to its normal shape once the baby is born. It's also possible that the shape of the belly button may slightly change.
Some perfectly unscientific articles say that the shape of your belly button can say a lot of things about your personality. For example, if you have an oval shaped belly button, you might be destined to be a teacher. A small, barely visible belly button means you're probably creative.
We all now have a lot to think about regarding our belly buttons. If you think about it, it's most likely the largest scar on your body. Props to you made it through this post without looking at your belly button.