• What is typical speech and language development?  http://www.asha.org/public/speech/development/
• Colorado's free early childhood evaluation and therapy program:  https://www.cde.state.co.us/early/childfind
• Information about stuttering:  www.stutteringhelp.org
• Early communication milestones for infants: https://firstwordsproject.com/about-16by16/​