KMN, funny you should mention gastro and a sensitivity afterwards. If I remember rightly DD had a bit of a tummy bug just prior to me noticing her reaction to milk.......... Might try a small quantity of uht milk and see if a reaction. The lactose free milk is UHT. now you've got me thinking. She definately had a reaction to something in my breast milk while breast feeding though and would vomit FOUNTAINS after a feed. It smelt rancid and burnt my skin where it contacted. felt like acid and left red blotches where it landed. I think I should see the dietician anyway though because I feel like I'm going in blind regarding her diet. been balancing it but I feel DD could eat more of certain things maybe. Probably the best time now to teach her to eat properly.