Squirmy after eating

Does anyone’s baby get squirmy after eating ? He burps and still continues to squirm . He doesn’t cry but he definitely seems uncomfortable and gassy. I used to pump and supplement with formula but now I’ve been giving him similac pro sensitive/ and the generic version up and up sensitivity. No matter what he has eaten he has always gotten fussy and squirmy about half of the time. I don’t know if this is normal or if I need to switch his formula. He doesn’t have any other major symptoms of milk allergy so I don’t even know what other formulas to try.