For the past few days, DS has been spitting up a lot of this watery looking stuff. Sometimes he does it hours after he has eaten? Is this reflux? He has been drinking bigger bottles lately since I've spaced his feedings out to 3 hours so maybe overheating? He also has been chewing on his fist alot, too so another thought was excess saliva from maybe teething. I googled and found it could be everything from GERD to too much saliva to the formula separating in his stomach. Anyone have experience with this?