DS doesn't do it every time he eats, but sometimes he will stiffen and arch and scream when I'm giving him. Bottle. Usually when it happens when he has taken a break and I offer more. H starts to suck and lets it dribble out of his mouth and then does the arch and yell. Is this reflux? Or maybe those times it's his way of saying he's full and I'm about to over feed him? Anyone else's LO do this? TIA!