Zero to Three also publishes a variety of resources for parents,[1] professionals and policy makers, most notably the DC:0–5™ Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood.
[2] Zero To Three's Healthy Steps program is an evidence based model that places development experts in pediatric primary care sites in order to provide screening and connect families to social services outside of the typical focus of medical professionals.
[4] Under the Affordable Care Act, Healthy Steps was initially designated as an evidence based home visiting model by the Department of Health and Human Services.
After conducting literature reviews and considering case reports and clinical experiences, the task force members identified diagnostic categories and specific patterns of emotional and behavioral problems.
[8] The first edition of the manual, DC:0–3 Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood, was published in 1994; in 2021 it was expanded to include children from ages zero to five.