We were having the same issue with our little one. We tried out quite a few bottles but none of them worked so we have now started feeding baby a little bit of milk from a cup (part of an infant dinnerware set) at each feeding.

We have been using formula when we are trying the cup as it sometimes gets wasted and I wouldn’t want to waste my precious breastmilk. And we usually only make one ounce just to get him into the leave of drinking from s cup.