J.N.
Hi J.,
I have 3 kids, 1 of which is only 8 mos old. I had to switch her to formula due to me getting pregnant & losing my milk. When I switched her, I used the slow flow, vent air platex bottles with the wide nipples. That way it is more like the breast. She refused it a few times, since she wanted the breast, but she eventually took it. If you haven't tried that, maybe you should. If you have, all I can say is to try, try again. She will eat if she's hungry enough. Good luck!