The FIRST step is to talk to your child's pediatrician.

Get a referral out to a psychologist, psychiatrist, people who are trained to diagnose these things. Also, if there is a center for autism around you, that can be a great resource.
My oldest son (7) is STILL on the cusp of an Aspergers diagnosis. It is a process...

03
Moms Expertise
About Alicia Canington
Born: Lumpkin, Georgia
Current: Columbus, Georgia
Birth: March 09
On Moms.com since: Jan 17, 2014
Mommy blogger, desperately trying to go green and get back in shape. Check out www.aliciainasmalltown.com for more info!