My baby has been doing this for ages. Also using mam size 2. I think the teats are fine. He’s just fussy. … Often screams and has to be persuaded to take the bottle for a while too. He did the same when I used to put him on boob
My baby also does this, so fussy with his milk atm x
My girl is the exact same, I've just put it down to the leap they're going through 😂