I have been trying to introduce a sippy cup to my 10mo son for the past month or so and he just can't seem to work out how to use it. I started with the transition bottles, which I couldn't even work out how to use, let alone him. Then I moved on to a cup with a a spout which had a valve in it. He worked out which part should go in his mouth, but just kept biting it. So I took out the valve so it is free flow, thinking that he would work out what to do once he noticed that liquid came out of the end. But he still just keeps biting it and then looks really shocked when his mouth fills up with liquid! I don't really want him having bottles all the time, because I understand it's bad for his teeth, but I'm struggling to know what to do. Will he just work it out for himself?