20 month old refuses to use words
I am a nanny for a 20 month old little boy and since I am not his guardian I cannot speak to his doctor. He understands everything I say. When I ask him to do something ie; please stop playing in the garbage, or after he gets mad and throws his cup or toy and I ask/encourage/help him pick it up he will not do it. He simply looks at me, crosses his arms and turns his back.he also will not use his words, and I know he can because he has said them before and uses them during play. He is making and surpassing all other milestones, but will NOT say; up,down, cup, drink, bite, more, please, or anything that can be said to express his needs or wants. He won't even say please for a French fry, unless its way after the fact and he thinks nobody is listening he will say please multiple times, when I hear him I praise him for saying please and give him something he likes ie; drink, bandana, cookie. Any sort of corrective phrase causes him to look at the floor and sometimes cry. I feel like he is very obstinate because I know he knows what he should do and not do. When he goes to do something he isn't supposed to do he looks to see if I will correct him, and I do, I'm very consistent with the rules.I have no idea what else there is to do.