After a steady climb since 2000, the prevalence of autism among school-age children appears to have stalled at 1 in 68.

Most children who have both autism and intellectual disability take their first steps on time or earlier than those with other conditions.

A new test claims to assess a child’s risk of autism based on abnormal folds in the placenta, but there is little evidence to support its use.

Women with autism show fewer repetitive behaviors than men with the condition on a standard diagnostic test, leading to possible underdiagnoses.

Some children who read early or speak late are misdiagnosed with autism.

The rate of autism among 4-year-olds is lower than that among 8-year-olds, suggesting that many children go undiagnosed until they start school.

Instead of debating about whether to screen all children for autism, we should be looking for better ways to identify children at risk and help them access services.

Left to languish in psychiatric institutions or drugged for disorders they never had, many older adults with autism were neglected or forgotten for decades. Efforts to help them are finally underway.

Despite the exit of its leader, the National Institute of Mental Health is moving forward with plans for a new system to classify mental illness.

The largest study of people with autism and obsessive-compulsive disorder to date adds to mounting evidence that the two conditions share genetic roots.