A friend of mine has a son that is a couple months older than my own son, they were each others first friends.

She was able to get a heads up early on, knowing that her husband had Asperger's Syndrome, and the doctor's had let them both know during the pregnancy that they had a high chance of having an autistic child.
Once he was born, there were no direct signs. I am pretty sure it shows up at many different stages, as there are a tremendous amount of different types of autism.
If you look at the Wiki article for this, you can see how large the list truly is, and its not even complete you know. Its a hard thing to deal with.
For my friend, she has a child from a previous marriage (teen now), and her son will be 6 this coming Nov. He doesn't run around and bang his head against the wall or anything, as I said there are many different types. He does however show signs of being autistic, and sometimes its been really hard for her.
In the entire time I have known them, he has gone from a large "handful" to what doctors consider "Mild Autistic". If you watched him play though, I doubt you would really notice, with the treatment he has received, hes just like any other little boy.
