E.W.
My daughter also had trouble figuring out the sippy cup. I found a sippy cup at Wal-mart (the Nuby brand) that has a silicone top that is flexible like a bottle nipple, but is designed like a sippy cup. We tried it, and she was able to figure it out pretty quickly. After a month with that she understood how to drink from a regular sippy cup. I hope this helps!