Well, my belly button "popped"... And no, it didn't make a noise like my dad had predicted.
I used to know this little part of my body well until it actually went in (it can happen!) when I was about 16... leading me to immediately buy a bikini in mid-winter Detroit... my dream had come true!
Outie, I will enjoy your company once again, but *please* go back in after the baby is born!
