Which conditions are included in the differential diagnoses of autism spectrum disorder (ASD) in children older than 30 months?

Updated: Sep 30, 2019
  • Author: James Robert Brasic, MD, MPH; Chief Editor: Caroly Pataki, MD  more...
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Autistic disorder manifests in early childhood. By contemporary criteria, the absence of abnormalities in the first 30 months of life rules out autistic disorder. For information about individuals with later onset of symptoms consistent with autistic disorder, see the following articles:

Many parents report normal development in their child until age 2 years before noticing the deficits in social and communicative skills.

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