J.K.
Are you breastfeeding also? If so, you may have to eliminate dairy from your diet. I never gave formula to any of my kids but it sounds like he may be sensitive to the formula also. My kids use soy milk with their cereal but all of my kids couldn't tolerate soy until they were about 10 years old. When they were younger, I'd use rice milk with their cereal. With babies, I don't know. I only breastfed but I had to watch what I ate because it affected my kids. Especially, dairy! Good luck!