Hi
DS is 7 weeks and I use the MAM teats in AVENT bottles. (Was finding my MAM bottles leaked and DS wouldn't take the AVENT teats - seems to like the flat MAM ones)
Anyway, he's on size 1 teats atm which are for 0+. The size 2 ones say 2m+ but how do you now when is the right time to change over??
He's a good eater, having a full 6oz every 3-3.5 hours and has one or a good few weeks now. However, the quantity is partly due to him being on Aptamil Pepti 1 which can make babies hungrier as its so watery!