Sippy sucess before 6 months?

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Anyone get have their little one take a sippy before 6 months?  Which ones worked for you?  Any tricks?

Ryan never did take the bottle, we still try ocassionally but he does best with a medicine dropper and he'll eat rice cereal mixed with BM with a spoon.  Silly guy!  Anyways I was thinking of getting a couple sippys to try in the next couple weeks and see if he'll go for that...