Why do some folks have an “outie” belly button and some folks have an “innie”?

I didn’t have the answer to this ques­tion until I deliv­ered my first baby.  I always believed that you had an “innie” if the doc­tor tied a good knot, and if he didn’t, you were cursed with that funny-looking “outie”.  Well, there is no knot tying at all.  We just put on a clip, cut, and wait for the umbil­i­cal cord to dry up and fall off.  It is all random.


Some­times some­one can develop an “outie” because they have a her­nia at this site.  This also has noth­ing to do with the doctor’s Boy Scout skills.  I have recently heard of plas­tic sur­geons remov­ing an “outie” for belly beauty.  How sad.


One ques­tion that can­not be answered, how­ever, is why some belly but­tons col­lect so much lint.

Excerpt from Why Do Men Have Nip­ples? by Mark Leyner and Billy Gold­berg, M.D.