Try a different bottle maybe? We use tommee tippee and he is fine with them, we do give him one bottle a day though so he’s used to it (10 weeks old on Sunday)
I’ve noticed he’s fussy on the temperature of the milk if it’s too cold he doesn’t like it and will refuse it
We had another go yesterday. It’s like she doesn’t really know what to do with the teat and just moves it around her mouth
My LO is the exact same, he was fine and then I stopped, he is 11 weeks, I try to give him one every night, some nights he will except and some nights he will just scream and gag until he gets the boob, we have mam bottles as well 😭