So... I've been going back and fourth on whether or not I should keep my 3 month old on his regular Similac Advance or just go ahead and switch him to Similac Sensitive! He has acid reflux and it got better when he got put on medicine for it a month ago but seems bad again. What should I do??? And what are your opinions on switching his formula to Similac Sensitive? When he was put on his acid reflux medicine on Aug. 16th the doctor Just didn't act like switching his formula was necessary and shook his head when I mentioned switching...