N.K.
I had to switch to a level 3 nipple(Gerber Orthodontic nipple) and it was fast and it took her about 4 days to get used to it but if you decide that, don't give up on it b\c it does flow fast and that's what's going to do the trick. I can't tell you how many moms I talked to with this same issue at this age and had to switch to the stage 3 nipple. It's her just getting bigger and with that come lots of changes. Some good some bad. I think there more stressful on us mommies than them!! Good luck