At What Age Is Autism Usually Diagnosed?
Learn the typical age autism is diagnosed, signs professionals look for, and how early identification supports better outcomes through timely intervention.
Reviewed by Nechama "Nicole" Fried, MEd, BCBA, LBA
Autismis most commonlydiagnosed between ages 2 and 3, though signs can appear even earlier. Some children show clear developmental differences, like delayed speech, lack of eye contact, or limited social interaction, as early as 12 to 18 months. Pediatricians often screen for autism at regular checkups, typicallyaround 18 and 24 months.
While early diagnosis is ideal, some children aren’t diagnosed until later, especially if symptoms are subtle or mistaken for other developmental delays. A formal diagnosis is made through comprehensive evaluations that may include observation, developmental history, and standardized tools like theADOS(Autism Diagnostic Observation Schedule).
Early diagnosis opens the door to early intervention, which can greatly improve a child’s communication, social skills, and independence over time.
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SOURCES:
https://www.nichd.nih.gov/health/topics/autism/conditioninfo/symptoms-appear
https://www.mayoclinic.org/diseases-conditions/autism-spectrum-disorder/symptoms-causes/syc-20352928
https://www.cdc.gov/autism/diagnosis/index.html
https://www.autismspeaks.org/signs-autism
https://www.webmd.com/brain/autism/understanding-autism-basics
