Signing "eat" and "more"

I've been signing to Stephen for a while now and he recently started signing "eat" and "more" back to me.  When we are playing he will sign eat and then run over to the pantry.  We just recently started more and I don't think he exactly understands what it means, but if I say more, he will sign it.  Ok, so technically he doesn't sign more exactly right, but for a 14 month old, I think he does pretty good.