I have D cup and now that i am pregnant they go at least 2 sizes bigger when my milk comes and them being that size really hurts because they feel heavy and you can even put your arms down because even they pop out the sides.I dont want them to get bigger because any lady on here who has had kids and breastfed know the pain of huge full boobes.If you look after your boobes even if they are on the bigger side they shouldnt sag i hope if you wear a good bra and dont just let them hang loose all the time.I have seen women with maybe a or b cup who are sagging badly so it makes no difference.Wear a good bra and all will be good.Maybe when u hit a certain age the do sag im not sure but im sure that if i grow old with someone i love and that happened they would not mind anyway.I like boobes all sizes except for fake silly ridiculous ones.