Autism is not a single disorder, but a spectrum (Autism Spectrum Disorder) of disorders that range from the severe Autistic Disorder to the milder Asperger Syndrome.
The autism spectrum disorders can often be reliably detected by the age of 3 years, and in some cases as early as 18 months. Studies suggest that many children eventually may be accurately identified by the age of 1 year or even younger. The appearance of any of the warning signs of ASD is reason to have a child evaluated by a professional specializing in these disorders. Possible indicators include:
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