This study develops and validates the Chatbot-Assisted Developmental Assessment Scale for Preschool Children (CADAS), a screening tool for 1-6-year-olds. Using AI and the Kebbi Air S robot, CADAS assesses motor, cognitive, language, and social-emotional development through interactive games. A total of 180 children will participate, comparing AI-robot and human assessments for reliability and validity. The project aims to create a localized, efficient, and accurate developmental screening tool to support early detection and improve child development services in Taiwan.