How do we introduce a different teats milk bottle? My lo using avent natural from birth till now. And now changing to avent classic. He doesn't deems to drink using avent classic.

Sometimes when babies are outside they tend to drink less because of stimulating environment so v distracted to drink properly. My son is like that. We just make a smaller feed when we are outside and feed what we can. Maybe within the half hr try to offer him the remaining milk while it is still somewhat warm. I will just have to feed him more when we reach home - maybe more cereal for dinner or he will be hungry at night and wake for one more feed or drink 30ml more at his night feeds I been using abt the same size test since day one (M size) He is 9+months now. If the flow too slow - sometimes u will see they suck till the teat "collapse" when they release it. If too fast (I tried to use L), they will drink a few mouths and then want to spit the teat out U can always use back whatever test that is working for ur LO