Hi there, with refluxers it is generally milk protein intolerence that causes reflux to get worse, the reasoning is that kids have a hard time in digesting the large proteins so they reflux more. Soy proteins are large like milk so you may have a hard tiem with the, the best is a hypoallergenic formula generally and it is easier for them to digest.

If the reflux is getting worse, ask about getting the right doses meds etc... unfortunaly a lot of doctors are not really proactive in getting or giving the right meds for refluxers and there are good meds out there.