Thanks ladies.
Jenny, what do you give your lo in substitution? You're right about the skin prick test, when we had her tested for milk when she was young they did blood work test instead. Are you able to give goat's cheese?
Scott's maw, I have never seen hypoallergenic milk here, do you mean the formula or actual milk?
I think I will have to start a food diary. The past 2 days I gave her yogurt and soy milk but no cheese and her bm was firm this morning yet has been firm in the past while eating cheese, maybe it's the quantity, maybe it's something totally different like eggs! She did have a mik protein allergy from birth though so that's why I'm still thinking it's milk related.