Excited - Because he either realizes something is on his ears and wants to check them out, OR he's discovered his ears and realizes there is something he can grab off of them and of course where does it go? Right to the mouth!
Nervous - These aren't cheap devices and I don't think they're water proof! Aiden's been drooling like crazy ... just waiting for a tooth to pop up ... but these aren't my ideal teethers! Plus, I know from reading other stories, it'll become a game of "In the Ears, Out of the Ears", and I can only hope I will win ... I'm predicting not.
While watching all of this, Aiden's daddy was practicing the airplane noise with him (aaaaaahhh-aaaaah-aaahhh-aaaaah) and flying around the toy airplane, when Aiden looked right at him and out came "aaaaaahhh", out of nowhere! We both just laughed! Hey ... you never know what he heard, and we choose to believe he heard his daddy talking to him and he wanted to particiapte in the conversation too!