The online Encyclopedia on Early Childhood Development is produced by the Centre of Excellence for Early Childhood Development (CEECD) based at the Université de Montréal and the Strategic Knowledge Cluster on Early Child Development (SKC-ECD) based at Université Laval, both in Canada.

The website is designed as a comprehensive reference tool for service providers, policy makers as well as parents on the development of young children from infancy to age five. Written by international experts on child development, this online encyclopedia offers, in lay language, summaries of the critical developmental knowledge for each age, as well as commentaries on current issues (e.g. technology use) from a developmental lens.

Of particular interest for SEL are the sections on emotions, peer relations, and prosocial behavior. Each section includes a synthesis of the research, as well as ideas on how to facilitate development, and further resources.

The Encyclopedia on Early Childhood Development also includes useful videos on these topics that are gathered in one YouTube channel.