Hey ladies,
my DS would sip the milk from his sippy and either let it dribble out or spit it out and scream, often throwing the sippy across the room....and he LOVES milk, it was in the WRONG drinking vessel in his opinion!!
So fast forward many many months and I kept giving him milk in cups and stuff, always rejected, then one day I gave him a cup of milk and a spoon and voila no more bottles, no screaming, all fixed!!
Give your LOs time sweetie, it will happen
xxLizzie