My girl have the same problem before, it started at her 3 mos and ended at her 6mos. At the worst time, when she saw the milk bottle she hate it and started to cry(I think her feeling is "oh no, my milk is coming!). I feel so upset and worry at that time coz all my friend wonder why it happen to me as their babies saw the bottle were so happy & exicting.
One month before,I bring her to the Dr. . The Dr. asked us not to force her to drink anymore, he said eating should be something for enjoy, normally this case happen because the parent was too worry and keep on force the baby to drink. The Dr. also give her some medice to make her have the appetite.
After she take the medicine and we stop forcing her, now she is OK ! Pls consult to u Dr and see what he can help.
Hope all you baby will have their appetite soon!