mylanta cherry supreme! It worked like a charm for us. some of the other liquid antacids (maalox, regular mylanta) are aluminum based, but the mylanta cherry supreme is calcium based, so that was a good one. I would tell you that you could use any brand that was calcium based. when we had a hard time finding it, we used cherry flavored maalox for Carter. I think it was aluminum based, but I was just cautious not to use too much to often and he was fine.
Definitely a big help!!!