Inclusion and LRE for young children has its origins in the Individuals with Disabilities Education Act (IDEA). We know from research and best practice that high quality inclusion in early childhood leads to social and education benefits for each and every child.
In addition to IDEA we have specific guidance:
National Early Childhood Organizations Supporting Inclusion
NAEYC Developmentally Appropriate Practices position statement and book reflect new research that underscores the importance of social, cultural, and historical contexts of development and elevates the need for active engagement through play, exploration, and inquiry in ways that support the whole child.
A Joint Position Statement of the Division for Early Childhood (DEC) and the National Association for the Education of Young Children (NAEYC) on Early Childhood Inclusion was written in 2009. The statement has a definition of inclusion and recommendations.
The DEC Recommended Practices bridges the gap between research and practice, offering guidance to parents and professionals who work with young children who have or are at risk for developmental delays or disabilities.