There are many resources available online discussing characteristics of autism or even videos comparing children with ASDs to typically developing children at various ages. If you have concerns about the development of your child or a loved one, please make use of these resources. Discuss your findings with your pediatrician right away and ask them to complete the M-CHAT-R screening on your child and or a referral to a specialist for diagnosis of developmental delays.

Autism Research Institute - A Parent's Guide to Assesments and Reviews
https://www.autism.com/knowthesigns#sthash.imzXAMZ7.dpbs

Centers for Disease Control - "Learn the Signs. Act Early." Campaign
http://www.cdc.gov/Features/DetectAutismEarly/

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