So I've read here that your boobs will generally shrink/sag after weaning. The thing is, I have tiny boobs pre-pregnancy. I was a 32A. Now I'm a 36A. I would say my boobs did not expand much, just that I have become wider on my chest area.
If shrinking is the way they'll go, I think the girls are going to disappear altogether! And is it possible for tiny boobs to sag? Holy cow, I don't even dare to think about it!