Im having the same problem! I have just started full time bottlefeeding (before i was just topping up) when I was topping up she was just on the newborn teat (she was angry breastfeeding coz it wasnt fast enough for her so i wasnt going to make it any easier from a bottle!) Ive had her on the 2 hole teats (Avent btw) and she was okay for a bit but now she seems to get angry and frustrated, i got the 3 hole ones and she near on chokes! ive tried 3 times and it scares the crap outta me, i get so scared i start whaking her back she chokes hell bad! I dont know what to do keep at the 3 holes or just leave it a 2 holes...