My DS is 3 with suspected ASD and last weekend had a bit of a bug(high temp, sleeping all the time). Once his temp dropped, he wanted to have a nap every afternoon which I put down to a post viral fatigue. My main concern is that he has suddenly developed a whiny tantrumy attitude which is really out of character (normally a placid boy). Due to speech delay, he is obviously finding it hard to articulate what's wrong. He is also suddenly crying for no reason. Do you think I have cause to worry or is this him reaching the "terrible twos" slightly later?