The "Developmental Screening Guidebook" is designed as a reference guide on how to best support healthy growth and development of children throughout key developmental intervals and identify children who may benefit from specialized support. Early childhood program staff, service providers, health care systems, families, and communities all play important roles in providing support and services to young children during this critical developmental period. The resources within this guide are intended to help program staff deepen their understanding of how children develop, regardless of their individual needs, and establish a comprehensive early identification system. A four-step framework for developing an early identification system so that children are receiving the necessary support is included. [For the 2020 edition of this Guidebook, see ED611895.]