What do you know about children with Autism? Do you believe it is triggered by vaccines?
I do not personally feell it is caused by vaccines, but I know its mainly from both genetic and environmental factors 
At what age do children usually begin to show signs of the disorder?
I would say that parents would see it at two or maybe three years old
What environmental factors seem to play a role in the onset of Autism?
It could be certain things during pregnancy in which they were in the womb, like drug use, and some infections. As far as after birth there is not much information out there besides the vaccine theory