Called NHS24 for DS who is 3 earlier tonight...symptoms point to a reaction to something. Chemist agreed when she saw him and he's had 2x2.5mls of antihistamine syrup. Been sound asleep since 8 and his temprament has been neither up nor down with ot. Just checked on him there and welts/blotches are now spread iver his body...is this to be expected?!