If you are concerned about your toddler's development, there is a screener call the M-CHAT that can be used as a tool to determine relative risk of autism. This is not a diagnostic tool, but something that you can use to facilitate conversations with your doctor when you discuss your concerns. Click here for M-CHAT.
I recently saw Dr. Ainsley Boudreau speak on this topic, and I am inspired to implement her strategies with my clients if parents/schools are open to it. Check out her video here: Peer-Mediated Pivotal Response Treatment.