Yes, no, maybe so?

Noah's learning to communicate yes or no through shaking his head. The trouble is, he shakes his head for YES. Tonight when Noah was eating his dinner he said "MO" (more) and so we asked him if he would like more dinner. He shook his head. So I said "No? You DON'T want more dinner?" He continued to say "MO" and point to the food, but each time I asked him if he wanted more food he'd shake his head. I would say, "YES? You want more?" and nod my head to show him how to respond. He'd then say "yes" while shaking his head.

I guess the only consolation is the fact that he doesn't actually know the word NO!!!!