What caused my child's autism?

The short answer is that scientists and doctors still don’t know. It is likely that autism is related to the way particular genes are expressed but it is not clear yet which genes are involved and whether all children on the autism spectrum will show the same genetic differences. Research at this point suggests that there are a number of genes involved, rather than a single difference. As a result, there are no blood or genetic tests that tell whether a child is on the autism spectrum.

We know more about what does not cause autism. Research has shown that it is not caused by parenting styles, too much television or too much sugar. In addition, large scale research on millions of children has not found a link between vaccines and autism. Nothing that a parent did, or didn’t do, during pregnancy or early childhood caused autism.