DS is one and a half years old and has been drinking milk from a bottle since he was born. He now drinks 150ml of cows milk before his nap and then another 150ml before bed. His routine is quite fixed and he sleeps well in the night. He drinks water from an open cup with no problem. But when we tried to get him to drink milk from a sippy cup or open cup he just tried a few sips then pushed the cup away and we had to swap back to the bottle. Can someone offer some tips on how we can transition him to a cup please? Thanks a lot!