One of the most popular autism checklists used by pediatricians is called the
M-CHAT (MODIFIED CHECKLIST FOR AUTISM IN TODDLERS) You can take this test online when your child is between 16-30 months. Take the test, print it out and bring it to your child’s Pediatrician.

Here is a link to the M-CHAT…

http://www.autismspeaks.org/what-autism/diagnosis/screen-your-child