I train my baby to use bottle when she was 1 month old! I am using nuk brown teats. She also refuse to drink with the bottle before, but I hv no way coz I need to work very soon, so, just let her cry, untill she is really hungry she will drink with the bottle. And now, my baby has no problem with bottle feed by my maid in day time, but when I am back at nite, and holidays, she wont drink with bottle coz she know mami is here! baby is veryy smart actually!