Well it made mine deflate after I stopped but recently I took a breast feeding class and the lactation consultant said that its not breast feeding, its genetics, if your mom has a flat chest then you'll probably end up flat chested but if she has a nice rack then you'll probably have a nice rack after having kids. Lol
Well mine went up a cup size but once I was done they went right back to per pregnancy size, I was so sad lol.