In addition, the clinical picture for children with an autism-spectrum disorder is often complex.

WSJ: How Autism Is Different in Girls vs. Boys

Of the 73 toddlers who were initially diagnosed with an autism-spectrum disorder, 13 of them, or 18%, no longer qualified for the diagnosis at age 4.

WSJ: Who Can Outgrow or Recover From Autism

Some experts have accused the DSM task force of making too many major changes with limited research evidence, such as eliminating Asperger's syndrome as a stand-alone diagnosis and subsuming it under an autism-spectrum disorder label.

WSJ: Revised Psychiatric Manual Faces Mixed Reviews

The work "provides convincing evidence there is a group of people who certainly have all of the symptoms of an autism-spectrum disorder when they're young, who look like they have no symptoms later, " said Thomas Insel, head of the National Institute of Mental Health, which funded the work.

WSJ: Who Can Outgrow or Recover From Autism

In the United States, 1 in 150 people are estimated to have an autism spectrum-related disorder.

CNN: Autism efforts go global at U.N. forum

Carers for autistic people claim that the Assembly Government has reneged on a promise to provide additional funding to accompany the much-delayed Autism Spectrum Disorder strategy, intended to be the first of its kind in the world.

BBC: NEWS | Programmes | Politics Show | Wales: Funding Autism strategy

Cohort analyses revealed consistent estimates of both the prevalence of parent-reported ASD (autism spectrum disorder) and autism severity ratings over time.

FORBES: Autism Prevalence Is Now At 1 In 50 Children