FYI: I'm IS
I've had small breasts since I was 10. Since being on ERT for twenty months, I really haven't had much growth. I wear a 38B bra. Even my HRT doctor is a bit concerned.
However, from what I've heard, those with AIS tend to be tall and slender, which i will be, when i lose weight. And honesty, I'd just be happy with about where I am, i just wish my right boob would caught up :-).