only time can help, my baby ( both babies) all rejecting bottle since 2months. #1 strikes for 3 months and trained by mil, changing teat no use, in the end she prefer her 1st bottle. #2 strikes for 4 months, as I taking care myself, so I didn't train her to use bottle very often. after 4 month, she suddenly can suck again
Have you tried changing the teat to a bigger size? The flow rate may be too slow
valim1990