is there any particular reason I can't mix my DS's vitamin drops with milk?

[spicemonster]

He's a year old and is now on cow's milk but he was really ill a few months ago and in hospital a few months ago and now absolutely loathes syringes and gets really upset if I try and give him any medicine. So if he needs calpol I just put it in his milk. Any reason I can't do the same with the vitamin drops?

I don't think so, except that if he doesn't finish his milk you won't know exactly how much he's had. Perhaps put the drops in a small amount of milk, then when he's finished give him the rest of his milk so that if he leaves any at least you'll know he's had all the vitamin drops.