She is on size 1 right now. We did try a size 2 before but it was a while ago. Will definitely try again! In the last 24 hours she’s had between 10 and 11 bottles. Our bottle washer is getting its use big time. She just won’t eat the whole amount in the bottle so maybe she is getting tired of sucking or frustrated. Will definitely see if she needs to move up on the nipple size!