Hmmmm.....tbh, I can't really see it making any difference. The Dr B's are designed to eliminate your LO swallowing extra air - they have a funny vent thing in it that channels the air down to the bottom of the bottle. With reflux, it's not air that is causing the problem, it's food/milk itself. Swallowing less air will give your LO less wind, which will make him/her less windy, and have fewer burps, which could then lead to less posset, but really, with reflux, he/she will still bring up the food anyway. At least that would be my logical resaoning on it!