Harrison's First Word

Every parent looks forward to hearing their child's first word, and I didn't realize it, but I have been hearing Harrison's first word for a while now. When I make him hold still to get dressed, he cries and says "Nuh nuh nuh nuh nuh!" And when I take away something that he is not supposed to play with (He likes to suck on Hairspray bottles, for example.) he cries and says "Nuh Nuh Nuh Nuh Nuh!" And when I make him come into the house after playing outside, he struggles SO hard to get away and says "Nuh Nuh Nuh Nuh Nuh!!" And when I brake off a bit of pizza instead of giving him the whole slice he gets very angry and says "Nuh nuh nuh nuh nuh!!!"
He makes it very clear that he is unhappy and I have to accept that we have indeed finally heard his first word, and, no doubt about it, that word is "NO".