C.K.
I had this same problem with my son (and dealt with it for over a year) until the Dr. ran a blood test for food alergies. I had to beg and pleed, but she finally ran the test. He is actually allergic to both cow milk and soy milk. He is now drinking rice milk which is not suggested for infants. Try just feeding him water mixed with pedialite for a two days and see if the gas and spit up goes away. If it does, you know it is a problem with the formula.