Dana,
Don't let him play you,lol ! It's not that he can't get the hang of it, he doesn't want to use the sippy because the bottle is his security blanket sort of speak. I would suggest you take away a bottle at a time and offer the sippy cup instead. He'll eventually get it, that it's the sippy cup or nothing. Believe me, I know it sounds a little harsh , but ,when he gets thirty enough, he'll be more apt to try it,and it won't hurt him to go without a few times. You just have to make up your mind you'll practice patience while he pitches a few fits. The other thing is : don't let the bedtime bottle be the last to go, it's usually the hardest to break away from and does the most damage to their teeth. If you can break away from that bottle you can do anything ! LOL GOOD LUCK and don't give in, he 's counting on it ! C. S.