Note: This study is complete. The information on this page is provided for historical purposes only, and serves as a bridge to the SECCYD datasets. The page is not being updated.
The Study of Early Child Care and Youth Development (SECCYD), now complete, began as the Study of Early Child Care (SECC), in 1991. Working with more than 1,300 children and their families from when the children were infants until they turned 15, the researchers collected information in four Phases and analyzed how different child care arrangements related to measurements of the children's health, behavior, school performance and other indicators of development in infancy, early childhood, middle childhood and middle adolescence.
SECCYD is the most comprehensive study of children and the many environments in which they develop.
The NICHD supported the SECCYD through cooperative agreement grants (U10s and a U01) that call for scientific collaboration between the grantees and NICHD staff. The links below provide more detailed information about the SECCYD.
To request additional information, please e-mail
James A. Griffin, Ph.D., the scientific coordinator for the Study, or visit the SECCYD data archive at