First I'll tell you what Buster has been like up to 3 days ago. He is a tease. He likes to pull his sisters hair just to hear them scream. He will jerk something out of your hands and run down the hall giggling. He fights to have his face washed; absolutely hates it. When told no he tries to just do it faster, more intense. He has the most wonderful mischievous smile I have ever seen. When I block him with my legs from going into his sisters room he throws himself at my legs between 5-10 times. And he is a chunk. He is almost always happy. He likes to hold (with help) Cherub. He loves being wrapped up in his favorite blankie. He loves stories, trains, dogs, big trucks, sticks, balls, running, laughing. He is only ticklish when he wants to be, and he likes to be tickled. He fights going to sleep. He gets out of bed and makes it miserable for his brothers to try to sleep. He always crashes somewhere on his bedroom floor. He takes the baby locks off the door, likes to take everything out of drawers, baskets, ect... He is noisy. Not with words but with these screeches that let you know he wants something. Or with jabbering or car or airplane sounds. Or hitting things together. He would follow me around the house, very active little toddler. That was 3 days ago. Now he is quiet. Has hardly even tried to talk, no sign language. No smiles. Just stands in one spot maybe moving to go sit down. Not playing. Not getting excited about anything, not getting upset about anything. He doesn't fight the word no. He just looks at you with a kinda blank stare and stops what he is doing. husband washed his face tonight with no screaming involved. I left his bedroom door open at bedtime. He hasn't gotten off his bed once. (His brothers have though.) He does eat, there is no sign of sickness but this drastic change in personality. His regular pediatrician is out of the office on Mondays so I'm going to take him in on Tuesday. I want someone to see him that knows what he was like before. I am very scared. It is like he is slipping away from me. I hope it is something physical and not really severe autism.