My son is 6 months old and I want to start him on solids. I want to start with rice cereal but I’m so confused on how to go about doing it and can’t get a straight answer from his doctor or online. Can someone please tell me how many times a day I should give him the rice cereal and how long he should be on it before I can give him something else? Also, do I have to wait a week between oatmeal, barley, and brown rice? Are those considered different? Oh and what’s this stuff I hear about arsenic in the rice cereal and not to give too much. How can I not give too much if I have to give it everyday for an X amount of time.