We're teaching Eleanor baby-sign-language because she's started to Hnnnnnn! at us when she wants something, and it's not cute. I've never met a baby that's actually able to manage the sign for 'more' right off the bat, but it's usually some sort of index-finger tapping or hand-flailing. Eleanor's looks like this:
It's so precious I could PUNCH something. She does it when she wants more food, or to be picked up, or whatever you have in your hand. And when it's something she's really into, like beets, she just clasps and clasps and clasps her hands in this adorably frantic hand-wringing.