I guess it's true... if you don't use it, you really do lose it. I find it interesting that Nate used to sign some ASL signs - like PLAY - more accurately at 16 months, when we were actively signing, than he does now at 23 months. And then there are other signs - like TURTLE - that he was never able to manage when he was younger because they require both hands and some intricate movements. He likes signing TURTLE now just for fun. The whole head wiggling thing provides hours - okay, seconds - of entertainment.