This 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. The following steps that are presented in this guidebook are intended to provide a framework for developing an early identification system so that children are receiving the necessary support to achieve academic success in typical early childhood environments: (1) Understand How Children Develop; (2) Encourage Development Through Daily Routines and Activities; (3) Establish a Developmental Screening, Intervention, and Referral Process; and (4) Support Families in Children's Developmental Progress.