Squirmy Feedings??

My baby is 12 Weeks (Bottlefed) and a few Feeds out of the day he gets very squirmy and distracted. His bedtime and middle of the night feeds he guzzles down his milk no problem. I try burping him till he burps then continue feeding but it continues. He's not spitting out the formula and it doing well on it, so not thinking it's that. Tried switching bottles.. sitting him up a little more.. going in a quiet room.. nothing😕 Anyone else with this problem?