I read online that it doesn't hurt to introduce your six month old to a sippy cup, so they kind of have a feel for it when it's time to really use it. Brodie's teething, and we also thought that he could bite on it to relieve some of the teething pain.
Once Brodie grabbed that sippy cup, it was all over! He'd shove that thing in his mouth and just start chomping down! haha He loved it! I think he really liked being able to hold onto it. He can't really hold onto his bottles by himself yet, but I think its because they're big and long. These cups are short and fat with handles, so they're easier to hold-in my opinion.
We did start first with a little water in it, but he would get that all over himself. So we dumped the water out and just gave him the cup. :)