Here are some of our favorite resources to take a look at.

Milestones by age: https://www.cdc.gov/ncbddd/actearly/milestones/index.html

American Speech-Hearing Association: http://www.asha.org

Pre-communication Tool Kit for Parents: https://leader.pubs.asha.org/doi/10.1044/leader.an2.22122017.61

Team Approach to Social Thinking: https://www.socialthinking.com/Articles?name=parents-treatment-team-teaching-social-thinking-well