Can babies go off of formula

Hayleigh

My sons four months for the last couple of weeks hes only been drinking 2-3oz every 2 hours instead of his usual 5-6oz hes on aptimil anti reflux and was doing great on it but now all he does it push the bottle away with his tongue and move his head around like a mad one. He will cry/scream until i give him a bottle then just messes with it x