Too little — or too much — of certain substances during pregnancy may increase the odds of having a child with autism. Here we explain what scientists know about these associations.

Autism and other neurodevelopmental conditions are more common among children born by C-section than those delivered vaginally, but the procedure itself does not underlie the association, according to a new study.

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

Women who use marijuana while pregnant may be more likely to give birth to an autistic child. But investigators call for a cautious interpretation of the results.

About 0.7 percent of children in China aged 6 to 12 — and 1.15 percent of 10- and 11-year-olds in Greece — have autism, figures that are consistent with prevalence estimates elsewhere.

Like so many other events this year, autism’s biggest annual conference — the International Society for Autism Research meeting — was forced to go virtual because of the coronavirus pandemic.

Intellectually or developmentally disabled group-home residents are dying from COVID-19 at twice the rate of all New Yorkers with the virus.

Brothers and sisters of people with autism are both about two to three times more likely than the general population to have an autistic child themselves.

The relative contributions of genetic and environmental factors to autism have held steady over multiple decades, according to a large twin study.

A short, widely used screening survey for autism called the AQ-10 may not be reliable for measuring traits of the condition in the general population.