I tried a bunch of brands and no luck... Had slightly more success when I switched to a higher flow rate (I'm producing a ton of milk and have strong Let-down... Thought maybe the bottle was too slow in comparison). But it was still a unhappy struggle. She spit out pacis too. And I kind of gave up trying for a couple weeks. Meanwhile she started playing with a wubbanub paci toy, and learned to suck on that... And I tried the bottle again this week (She's just turning 4 months) and she drank it down like it was no big deal!! And has done so daily since! So there's still hope for you that your LO will figure it out!
Reply to My LO is four months and has been refusing the bottle.