I think he sounds great! I have no professional experience, just a 19 month old little man :) I wish mine would not say "no-no", he just picked it up..lol. My son will not say "more", he just does the sign for it. And there are several words, like robot, he won't say, but he goes "beep-beep" and moves his little hands like a robot might do. Another one would be "truck"...sometimes he will say it, but other times when it is time to leave, he will say "bye-bye, vroom-vroom". Per my mother, the teacher, I have my son look at my mouth when we come across a new word that I can tell he is trying to repeat, and it helps! Per her advice as well, is to teach him the sounds each letter makes; I have the Leap Frog Alphabet Pal. Good luck :)