All these months we couldn't get Ian to drink from anything other than a regular cup that we would hold for him. We think it was because it was too much effort to get just a little liquid out of some of the sippy cups so he just got impatient and would get really mad if we tried to make him drink from a sippy cup. I finally found one by recommendation of his pediatrician that has a straw and that he can get a decent amount out of quickly. It took some doing to teach him how to work a straw but he finally got it. YAY!