I'm not sure about it. At first it looks like he doesn't have to speak because he would just cry and be asked 500 questions until one suits his needs and then he nods. I was trying to test him earlier and he would just repeat what I'd say....not actually answer me.
me - can you say car?
.........
me - say c...c...car
.........
me - ******** are you listening to me?
.........
me - yes?
yes
(face palm!)