I've just started weaning and have noticed that over the past few days that one of my 6 mo ID DTs gets a red rash in her face immediately while eating porridge made with full-fat cow's milk. She also seems to be a bit wheezy. At first I thought it was happening afterwards, and that she might be allergic to the wet wipes that I wiped her face with - but today it definitely happened as she was eating. And funnily enough her sister LOVES the porridge but she really doesn't seem that keen, which is totally out of character as she wolfs everything else down.
So my question is, is it possible for ID twins to have different responses to food? Does anyone have any experience of this? And also, can you do a skin prick test to check a cow's milk allergy?
TIA