Re: Disappearing Nipple... HELP!
Mama, this is a problem that has me 
I think you should seek some in-person help from a LC, preferably an IBCLC. I am thinking that maybe what is going on is that you have a plugged duct that is close to your nipple. When the baby sucks, the plugged area gets swollen, making the nipple appear to disappear. But this is just a guess. I'd really want hands-on help for this one!
Was your nipple originally inverted? If not, I doubt thatit's going to become inverted. Usually nipples evert more as a mom nurses, since the constant sucking breaks the adhesions under the skin that hold your nipple flat or pull it inwards.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"