Hi, I am having the same problem with the same formula. We are using Dr Brown bottles with the level 1 teat. DD is 15 weeks old and every time (I have tried several times) I change to level 2 because she takes forever to eat 4oz, she eats a lot quicker but we have serious issues with her reflux. I thought maybe it was just a coincidence (I have just posted a thread, can't put link as I'm on my phone) but you are having same problems. How old is your lo? Has she always been on same teat with that formula? Or have you changed before? Sorry for all the questions I just wonder if my DD will have to stay on level 1 forever (hope not as she hardly eats at one sitting)