<<Disclaimer: Verify this information before applying it to your situation.>> I don't know about cow's milk, but I do know my son had allergic reactions to my milk, before he was even 6 weeks old! There may be extenuating circumstances, because we know now that my liver was not functioning correctly, so that may have affected my milk production. Whatever is in the bloodstream, gets into the milk. I would imagine that is the same with cows, but I've never studied it. As soon as I went to a wheat-free, corn-free diet, my son's conditioned improved dramatically. It was then that I had oat bread, and he reacted to it through the milk - he only had milk at the time. Now we are both on the diet (he is eating solids now) to keep him symptom-free. Kirsten [log in to unmask]