I started with a sippy cup by about 6 months and offered it occassionally. Didn't really get the hang of it till about 8 months and it took till about 10 months before he was keeping most of it in his mouth. But he is doing great with it now. But, I wasn't needing him to drink whatever was in it - it was optional and he was still nursing regularly as well. The sippy cup was more for a little water and for him to learn to drink from a cup.