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

The combination of obesity and diabetes in a pregnant woman substantially increases the likelihood that her child will have autism.

People with an extra copy of the autism-linked chromosomal region 16p11.2 have a range of characteristics, suggesting that other genetic factors are at play.

Nearly half of siblings of children with autism have difficulties with attention, language, learning or mood.

About 1 in 45 children in the U.S. have autism, up 79 percent from the estimate for 2013. But there is more to the apparent jump in diagnoses than meets the eye.

Researchers have defined a new syndrome that results from carrying two mutated copies of CNTNAP2, a gene linked to autism.

An analysis of blood samples from nearly 17,000 individuals with autism points to new regions of the genome likely to be involved in the disorder.

Some infants who are later diagnosed with autism have trouble holding up their heads or following objects with their eyes as early as 6 months of age.

Visual processing irregularities in autism are subtle and depend on the child’s age, gender and task at hand.

Parents can spot early signs of autism in their children but doctors don’t always listen to them, suggest two new studies.