Well folks, 10 months old and mom and dad agree my first word has surfaced. I've always known the cute funny guy is my dad, but I liked saying 'da da" so much I said it to everyone and everything: the doorman, the checkout person at target, my bear, Brian Williams (mom swears she never met him).
But today I looked him square in the eye, the theme from Chariots of Fire playing, and I said it with conviction - "Daddy!"
Mom and Dad looked at each other and declared it official - Daddy is my first word. primogeniture is next.