For those of us who have “innie” belly-buttons, what is keeping our belly-buttons “pulled in” that causes them to stay indented on our stomachs without eventually flattening out?
In: Biology
It’s entirely random, however only about 10% of the population ends up with an ‘outie’. It has to do with how much skin makes it onto the umbilical. If there’s a lot, then it stays out. If it’s ‘normal’ then it eventually grows in. Doctors can’t control it.
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