Developmental Norms (also Known As Developmental Milestones)
Here's your citation in American Psychological Association (APA) format:
Developmental Norms (also Known As Developmental Milestones). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Developmental+Norms+%28also+Known+As+Developmental+Milestones%29