We had to switch to oatmeal b/c of constipation issues, it has more fiber than rice(well, 1 gram as opposed to none in the rice), maybe the fiber is causing the gas? I think there is another cereal that’s single grain as well, barley? I think that’s it but I don’t know much about it, whenever I’m feding Aidan a food that i know will cause gas, I found that the trick is to give them gas drops RIGHT after they eat as opposed to when they start getting gassy…hope this helps, gas pains are horrible for little ones!!!I hope he feels better!!!