DC:0–5™ Manual and Training

An essential guide to infant and early childhood mental health diagnostic formulation with infants, young children, and their families, in a wide range of settings.

We are proud to offer the DC:0–5™ Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood Version 2.0 , the DC:0-5™ Casebook and the DC:0–5™ Clinical Training for infant and early childhood mental health professionals.

DC:0-5™ Manual

In 1994, ZERO TO THREE published its groundbreaking manual, DC:0–3 Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood. The first developmentally based system for diagnosing mental health and developmental disorders in infants and toddlers, this critically important guide quickly became an indispensable resource for mental health clinicians, counselors, physicians, early interventionists, educators, and researchers.

DC:0–5™ Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood, first released in 2016, captures new findings relevant to diagnosis in young children and addresses unresolved issues in the field. The updated DC:0–5™ Version 2.0 arrived in 2021 and enhances the professional’s ability to diagnose and treat mental health problems in the earliest years by identifying and describing disorders not addressed in other classification systems and by pointing the way to effective intervention approaches.

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What's New in DC:0-5™?

DC:0–5™ Version 2.0 includes clarifying language throughout the manual and the inclusion of numerical codes to help facilitate the inclusion of DC:0-5 disorders.

Discrete numerical coding provides consistency among various disorder lists and can prevent misunderstanding when translating diagnoses into other languages. This updated information is available for free as a supplemental. 

  • Includes disorders occurring in children from birth through 5 years old
  • Criteria extended to younger ages when appropriate, including, in some cases, to the first year of life
  • Introduces discussion of several new disorders, including:
    • Relationship-Specific Disorder of Early Childhood
    • Dysregulated Anger and Aggression Disorder of Early Childhood
    • Atypical Social-Communication Emergent Neurodevelopmental Disorder
  • Retains the multi-axial system, allowing optimal consideration of context in assessment and diagnosis; most axes revised substantially

DC:0–5™ Training

DC:0–5 Version 2.0 and associated ZERO TO THREE DC:0–5 Training build on the powerful legacy of the DC:0-3 using the latest scientific findings and clinical research. ZERO TO THREE is the only official training provider for DC:0–5. The curricula have been designed to meet the needs and interests of multiple audiences through a variety of modalities consistent with the content and approach of DC:0-5.

Currently, there are four main categories of DC:0-5 training offerings:

  • DC:0-5 Clinical Training
  • DC:0-5 Seminars/Overview Training
  • DC:0-5 Faculty Teaching Resource
  • DC:0-5 Training-of-Trainers
Continuing Education credits (CEs) are available for ZERO TO THREE training programs.
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The New DC:0–5™ Casebook

Featuring over 15 case studies jam-packed with practical tips to support your work with young children and their families.

The casebook is a compilation of case studies as a companion volume to DC:0–5™: Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood (DC:0–5™; ZERO TO THREE, 2016, 2021). It is designed to strengthen understanding of clinical disorders in infancy and early childhood, and to help clinicians better understand the application of the multiaxial framework and culturally sensitive/relational approach to diagnosis that is fundamental to DC:0–5™.

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