Young children between the ages of birth through 5 years go through stages of development at a rapid pace that varies not only from one child to another but also across domains (social-emotional, physical, cognitive, and linguistic). Early and periodic screening ensures children's healthy growth, making sure they are meeting all critical developmental milestones in the early years. Utilizing reliable, valid, and appropriate screening tools affords invaluable information to detect and respond to any potential developmental concerns that may benefit from further evaluation to identify the need for early intervention services or other supports. The purpose of this overview is to provide a variety of resources to support Child Care and Development Fund (CCDF) Administrators in meeting the provisions of the Child Care and Development Block Grant Act of 2014. (author abstract)