Try change the teat? There was once my boy reject milk when he just attended his infant care at 2mths plus. Thought he not use to the environment or the bottle cos i was breastfeeding n latch him since birth. End up donno how n why (cant rmb), teacher change to pigeon teat n he ok.
I donno hear pple say or read or what that if the teat too hard or too soft or too lil flow or too much flow, the baby not comfy drinking will reject.