We tried regularly to get DD to take a bottle from about 4 weeks and it was a total nightmare. If I was out of the house, she would occasionally take it but only after fighting it for so long she got tired and gave in. Even then, she would only take 2-3oz at best. We bought Dr Browns, Tommee Tippee, Medela, NUK and finally MAM bottles - seriously we spent a fortune! She seemed to take the MAM bottle easier than any of the others so we stuck with that one and continued to try her several time a week.
Then, one Sunday afternoon I was absolutely exhausted and she was having a feeding marathon. I was on the phone to my mum sobbing because I was so tired and fed up and basically just wanted a break. My mum suggested trying her with some formula in a bottle to see if the taste made a difference. I was reluctant as I have worked so hard to get BF established and maintain a good routine etc but I was desperate so we gave it a shot and she knocked back 5oz of Aptamil! She would only drink it if it was really warm and I had to be out the house (think she can smell my BM). We kept offering it every day for a week and she kept taking it so then we tried her with some expressed breast milk and she took it! Now she will take formula and BM in a bottle and she even takes it whilst I am sat next to her. We now have a routine where she has one bottle each night from DH before bed, not because I need it but because I am scared if we stop offering it she may go back to refusing it again lol.
X