More boys than girls have autism; diagnostic biases and genetic factors may explain the skewed sex ratio.

Many children eventually diagnosed with autism lose social skills between 18 months and 3 years of age. But few parents notice this trend.

The bulk of the increase in autism prevalence in the United States between 2000 and 2012 can be attributed to children on the mild end of the spectrum.

About 1 in 59 children in the United States has autism, according to data released today by the U.S. Centers for Disease Control and Prevention.

Children with autism typically have four or five other conditions, such as attention deficit hyperactivity disorder, that can affect when they are diagnosed.

Folic acid, a B vitamin, may lower autism risk and ease features of the condition.

Women who take acetaminophen — commonly marketed as Tylenol in the United States — early in pregnancy may increase their daughters’ risk of language delay.

Children of women who are hospitalized during pregnancy may develop poor physical, social, cognitive or emotional skills.

Researchers find a surprising link between certain pollutants and reduced autism risk, the world welcomes — and fears — the first primate clones, and new U.S. clinical trial rules reverberate globally.

Common genetics may help forge social ties, a nonspeaking woman with autism hosts “The Late Show,” and the mix of bacteria in the gut may relate to brain structure.