nining,
my boy had the same prob of rejecting the bottle...read up on it, apparently they start to indicate preference at 3 months..
what i did is that i'm making sure i give him the bottle once a day..just convince him to have at least 1oz also never mind..and make it like a game, and non stressful..praise him when he takes even a TINY bit....I just kept trying, and when he's hungry enuff, he will take at least a bit.....tho the max he takes is 2oz, which doesn't last him as long as his usual time (compared to when he latches on)..hope this helps!