I've heard that putting the BM on your finger and finger feeding is one way to get expressed milk into a young baby. Have you checked the nipple (is the flow too fast/too slow?).
Stick with it. My LO doesn't like the bottle either but DH has been giving her one every day for the past 3 weeks. She now takes up to two ounces at a time. That's not great, but better than she was at first when she would choke and refuse it.
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Re: Tips for getting LO to take a bottle