Dr. thinks that my 4 week old son has reflux. He doesn't spit up all that often but he seems to be crying a lot after drinking his formula. I tried to give him more formula thinking he is still hungry but that doesn't work. Dr. wants to give him Zantac. I think that giving him meds should be a last resort. Does anyone have any suggestions for a different formula. He is now taking Similac Advance. Should I try soy formula?