I tried doing a search about this on Google, but all I got was a lot of really disturbing porn.

I'm pretty sure that whether you have an "innie' or an "outie" has NOTHING to do with whether or not you were breastfed. It only has to do with how you healed after your umbilical cord was cut.

(for the record, I wasn't breastfed (I was actually allergic to my mother's milk) and I have an innie. I do not plan to breastfeed my child, if I am blessed with one, either.)