We decided to give David a go with a sippy cup this evening with his dinner. He didn't know what to do with it at first. He seemed to be thinking, "Is this a toy?", "Should I chew on it?", "Maybe it's a teething toy." I showed him how to hold it and he caught on quickly. But, it was hard for him to turn it up enough to get the watered-down prune juice out. He tried it a few more times and then was ready to move on to his dinner.