Wind or reflux possibly? My girl was like this up until 12 weeks because she had a milk allergy and severe reflux so as she was trying to drink it was coming back up and burning her throat. So she’d pull away due to pain, but still be hungry so want to drink. Things got better when we changed to hydrolysed milk and she was on omeprazole x
Could be reflux, could be that they ain’t hungry and actually want to soothe by sucking or could be bottle aversion. If they refuse the feed then don’t persist and force it as it makes things worse. The book recommended above is defo worth a read. My son will sometimes only have 2-3oz then refuse more and it’s just that he’s not hungry anymore. He tends to refuse morning bottles but take more in the afternoons. I’ve logged his feeds and overall for the day he’s having between 20-27oz so he’s fine. Just some days he has more and some less.
My twins are 13 weeks, my girl twin went through the same thing and I put it down to bottle aversion and followed the rowena bennet (I think that’s her name) method. Basically you offer the bottle, if they refuse it in any way at all you stop for 10 minutes, then re offer, and if they refuse again you end the feed entirely and don’t re offer anything for at least an hour (but try to go to the next feed time if possible). It did reduce her milk amount for a few days but it corrected itself after a day or two and she now happily takes bottles. Trying to persist and force it only adds to the problem (but so easily done when you’re worried about milk intake!!)