I have a 3 year old son. About 6 months ago it came to our attention that he seemed to be speech delayed. At that time, someone at day care mentioned autism He has a bunch of cars from the movie Cars, and when he plays with them, he lines them up. He did that almost exclusively up to about 5 or 6 months ago. He still lines them up, but will spend some time playing with them more appropriately as well. (driving them, etc). He really doesnt care for many toys other than cars.Apparently he has "antisocial" behaviors at school. Basically he had two friends that he likes, and other than that, doesnt want anything to do with the rest of them. .He likes his "alone time" alot. I have noticed that if he is playing with his cars and I come in there to see if he wants me to play, he will usually say "leave". He knows lots of words, probably hundreds. Cars, trucks, colors, stars, shapes,moon, etc, he can all identify and say. Some of the words are clearer than others. He can count to twenty as well. At bed time he will sing with his mother and i his ABC's, twinkle twinkle little star,etc, not clearly .He speaks mostly in one or two word sentences, usually when he wants something. Want milk, etc. He runs and plays normally, can climb, can catch and throw some. He is learning to play baseball Wii with his brother.He seems empathetic to me. If his mom stubs her toe, he will be concerned and say, its ok mommie, its ok.He is a loving child, from my perspective. He likes hugs and kisses.He looks us in the eye and and smiles. He answers yes no questions. Did you brush your teeth? ? He follows directions. (For the most part) Brush your teeth, pick up your cars. He likes his alone time, and will often go into his room and shut the door (plays with and lines up cars). He gets frustrated and throws tantrums when he doesnt get his way.The school is going to have someone come in to evaluate his speech, do i need to have him evaluated for Autism?