I think most women can say goodbye to their old boobs after breastfeeding (and pregnancy). I don't think they're ever the same again but some women are happy with the change, others not so much . I was a very perky and firm (12) C-D cup before kids. Two babies later and they're saggy B cups now. I actually just had to buy B cup maternity bras over the weekend, the first B cup since I was a teenager.

After DD1 weaned, I was still a C cup but one breast was a bit smaller than the other. I found I needed a slightly padded cup in my bras to compensate for that. I think I'll need push up bras when DD2 weans!