Mel--I agree with others. I'd limit all dairy and then after 2 weeks, perhaps try somethings with traces and experiment from there.
My DS reacted when we gave him yogurt around 8 months, then reacted to cheese around 10 months, then reacted to cheese filled tortellinis around 11 months, so we eliminated all of it, even trace. Every once in a while will have an ugly night with waking, screaming, arching, can't sleep, in pain behavior and we'll go back and realize he ate something unusual (like generic golden grahams with DH
) that contained a small amount of dairy, so we know it's still a problem. However, we'll also occasionally let him eat something and later realize it contains trace dairy, but it didn't bother him, so we continue to let him have that.