Cal will be three in September. He has a lot of random language, displays an innate attraction towards reading, can memorize any song he likes, but rarely responds to questions, expresses preference or volunteers speech. When he wants something, he points (or, more often, doesn't) and makes a hacking, weeping noise. Recently he's taken to shrieking like a teakettle if you do something he doesn't like or won't let him do something he wants to.
OTOH, the other day he was hanging around in the kitchen, when he does because he knows I don't want him to; I told him he had to leave, asked him: "What do you know?", ie, you know you don't belong in the kitchen. He sang back--the the tune of the everpresent "subway song"--"Yes, the kitchen, please." His first sentence, maybe. And I let him stay, because A) He used words and B) He said please.
At any rate. I don't know what any of this means, and no one seems able to tell me, either--autism spectrum behavior? Possibly. Maybe probably. Solution? Who knows, yet.