my LO is 3mths old using avent bottles. but still using 0+months teats. tried the level 2 but guess flow too fast. LO rejects and push away and didn't finish the milk. is it OK for LO to be still using newborn teats? worry might affect LO growth development in certain ways. pls advise. TIA.

It's fine to be using newborn teats for your LO even he/she is 3 months old. I change the teats only when I see my LO is making lots of effort in sucking or when having long pauses in sucking. I don't usually follow the ages they put, that's just a guide. All babies are different, development might be at different timing. My friend's LO was using level 2 at 1 month plus. Most importantly is getting your LO to drink as much milk as possible. No point in following the ages written on the box of the teats, but your LO is rejecting milk or is uncomfortable and not finishing up milk.