After all the new stuff that's come out about plastic, I'm newly motivated to teach LO how to drink from a real glass. I'm going to get some of those small tempered glass tumblers, and was wondering how you have gone about teaching your LO to drink from a glass. LO is 16 months old, and while he drinks very well from a straw cup, he has never tried an open glass before. He also really likes throwing his straw cups on the ground. Any tips welcome!!