The document is a second edition guide to cognitive development and learning for infants and toddlers, developed collaboratively by the California Department of Education and WestEd. It emphasizes the importance of caregiver responsiveness, self-directed learning by children, and the role of culture in cognitive development, providing practical guidance for infant/toddler care teachers. The publication aims to support high-quality early care and education programs, fostering healthy development in all domains for young children.