The growth differences vary between autistic boys and girls and are most apparent among children with prominent social difficulties.

Two new words and a text swap in the American Psychiatric Association’s diagnostic “bible” are unlikely to affect clinical practice, experts say.

The bulk of the increase in autism prevalence stems from a growing awareness of the condition and changes to the diagnostic criteria.

Some people who have lost the diagnosis of Asperger syndrome say they feel a loss of identity and worry about a loss of services.

Doctors often conflate autism and intellectual disability, and no wonder: The biological distinction between them is murky. Scientific progress depends on knowing where the conditions intersect — and part ways.

Less than 1 percent of young children in northern Vietnam have autism, but this prevalence is higher than in previous reports.

Social media is connecting families with researchers who study rare conditions related to autism — to the benefit of both.

The fight between those who define autism as a medical condition and those who see it as a mere difference has reached vitriolic levels. Can the two sides come together to support all autistic people?

Grunya Sukhareva characterized autism nearly two decades before Austrian doctors Leo Kanner and Hans Asperger. So why did the latter get all the credit?

The network of researchers keeping tabs on autism prevalence in U.S. children plans to follow up with some of those children in adolescence.