Its always best to persevere with the drinking cups and sometimes you have to try a few befory you find one that they like. I learned the hard way and gave my son juice out of a bottle because thats all I could get him to drink out of. I gave up too soon and he suffered with his teeth because of it but I didnt really know any better at the time. He had to have 4 teeth out when he was 3 and had to be sedated. It was awful. I have always found the boots own ones the best for starting off with, they are suitable from 4 months and are only quite cheap. I think they come in blue, pink and green. I now will not give them juice at all out of a bottle, just milk or water, if they want juice it has to be out of a cup.