I wouldn't worry too much. My son is 13 months and says mama, dada, and da (for Jack our dog). That's it. He understands really well and knows to go sit on his potty when I say the word, but as far as distinct words...not much. He jabbers constantly though! As with the previous answers..all babies develop at different times. My brother didn't start speaking until 3 years old. (Of course everyone was concerned by that point) But when he did start talking it was in complete sentences. No first words or anything. (granted that was a very late start)If there are other siblings it might be possible that they speak for him some? Or that he gets what he wants by pointing, grunting, etc. and feels no need to learn words.Also how much are you speaking to him? I tend to not talk as much and I think that is one reason my son hasn't learned more words. We sing and play and read, but I've heard it helps alot to talk out what we do....ex. "I am doing laundry now. I'm putting the dirty clothes in the washer so they can get clean."