luplupchan: My daughter also have similar problem. She is exclusively BF since we left the hospital. She didn't gain a lot of weight for the first month but she is staying at the 50th percentile now.
She never like the bottle, even back at the hospital. I started to pump milk and have my maid gave her the bottle when she was 1.5 months because I really need to take a break once a week, get out of the home and spend time with just my husband.
At first she will take the milk from the bottle if she is really hungry. Then she completely refuse to take any breastmilk from the bottle around 2.5 months. She will take like 1oz only in 5 hrs.! I have no choice but to continue to BF her myself. I have no clue what to do if I have to work full-time, but I'm proud to have BF her for 4 months now.
Don't give up!