LO is 7 months and at his 6 month appt his ped told us to start inroducing solids and a sippy cup. I tried a more tradiontal sippy that you tip up and one with a straw and he just doesn't "get it".We've tried it a few times and I think he managed to get some water, but I still don't think he really understands. Did you just offer it with solids? Do you offer water in a sippy throughout the day? Does it just take time for them to get used to it?