The Early Years Check-In Implementation Toolkit is a comprehensive guide to support the implementation of the Early Years Check-In (EYCI) and Play&Learn into practice. The Toolkit is intended for early years professionals and others working in settings that foster early child development, health and well-being such as EarlyON Child and Family Centres, child care settings, and other environments that support children and families in the early years. The Toolkit includes materials to support the successful implementation of the EYCI and Play&Learn through real-life examples, tips, and case studies from early years professionals across Ontario who are already using the EYCI and Play&Learn with families.