Does an early autism diagnosis usually remain over time?

In one sentence

This review suggests that most children diagnosed with autism before age six still met diagnostic criteria years later.

What the researchers did

Researchers reviewed 49 follow-up studies involving more than 11,000 children who received an autism diagnosis in early childhood.

They wanted to understand whether children still met autism criteria when reassessed years later. Depending on the study, follow-up assessments happened anywhere from one year to more than ten years after the original diagnosis.

Most studies were carried out in North America and Europe. Most participants were boys, and some children also had intellectual disabilities or other developmental differences.

What they found

Across the studies, about 92% of children still met autism diagnostic criteria at follow-up. In simple terms, roughly nine out of ten children continued to be diagnosed as autistic years later.

At the same time, the researchers stress that keeping a diagnosis does not mean a child cannot make major progress.

Many autistic children continue developing important skills over time. Some improve significantly in communication, daily living skills, emotional regulation, learning, or independence.

The review also found that a smaller group of children later no longer met full diagnostic criteria for autism. However, researchers still do not clearly understand why this happens in some cases and not others.

The authors also note that the overall quality of evidence was not very strong, partly because many studies used different methods and older diagnostic systems.

What this means for families and therapists

For many families, this review may help reduce uncertainty around early diagnosis. The findings suggest that an autism diagnosis in preschool years usually reflects a long-term neurodevelopmental difference rather than a temporary delay that simply disappears.

At the same time, the review strongly does not suggest that development stops or that progress is impossible. A child may continue gaining skills and becoming more independent even if the diagnosis itself remains.

The study also suggests that stories online about children completely “growing out of autism” should probably be viewed as uncommon situations rather than the typical outcome.

For therapists and support teams, the findings support long-term planning and ongoing support rather than expecting autism to quickly disappear over time.

Limitations and what we don't know yet

The researchers rated the overall evidence quality as low, meaning the true numbers could be somewhat different.

Many of the included studies were also older and may not fully reflect current autism diagnostic practices.

The review could not clearly track detailed changes in social communication or repetitive behaviors over time because many studies did not report that information consistently.

Researchers also still do not know exactly why some children show much larger developmental changes than others.

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This is a simplified summary of Overall prognosis of preschool autism spectrum disorder diagnoses by Brignell A, Harwood R.C, May T et al., Cochrane Database of Systematic Reviews (2022).

Source license: CC-BY-NC-4.0.

This is not medical advice. Please consult a qualified healthcare professional before making therapy decisions.