actually, i'm starting to think he knows words and just chooses not to use them. on 3 different occasions i've pointed to nick and said "who's that?" and each time he's glanced over and said "dada" so casually and then gone about his business, but he's never said it voluntarily. then yesterday he kept waving to himself in the mirror and going "hi!"
he's a little rapscallion. i'm sure one day he'll just start talking and i'll never be able to shut him up.
hey, einstein didn't talk until he was like 3!