I used stomach calm on Matthew, but I found "Infants Friend" to be so much better. You get this one from the chemist too. He didnt have reflux but used to get a lot of wind and would have great difficulty getting it out. His tummy would go rock hard too. I found the Infants Friend worked within a couple of minutes and the wind would come out both ends I believe it is suppossed to disolve the gas bubbles in the tummy.