S.S.
I am giving my daughter the same formula. I use the Parents choice bottles for anti cholic (Dr. Brown style). I had to take the nipples and make the hole a little bigger with a pairing knife. You have to be careful not to make it too big. You just need to put a little slice in it. My daughter was collapsing the nipples. I even tried to use the 3 stage nipples and they don't work as well with this formula. Best of luck and if you would like to contact me personally about it you can e-mail at ____@____.com