DC:0β5β’ Manual and Training
An essential guide to mental health diagnosis for infants and young children.
We proudly offer:
- Official DC:0β5β’ Training: Expert-led training to support childrenβs mental health and development.
- DC:0β5β’ Diagnostic Classification: The essential tool for diagnosing mental health and developmental disorders in young children.
- DC:0β5β’ Casebook: Practical case studies to apply diagnostic standards with confidence.
DC:0β5β’ Manual
In 1994, ZERO TO THREE published its groundbreaking manual,Β DC:0β3 Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood.
This guide is the first system for diagnosing mental health and developmental disorders in infants and toddlers. It quickly became an essential resource for mental health clinicians, counselors, doctors, early interventionists, educators, and researchers.
DC:0β5β’ 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 updatedΒ DC:0β5β’ VersionΒ 2.0 arrived in 2021 and enhances the professionalβs 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.

What's New in DC:0β5β’?
DC:0β5β’ Version 2.0 includes clarifying language throughout the manual and the inclusion of numerical codes to help facilitate the inclusion of DC:0β5 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.Β
- 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:0β5β’ Infant Mental Health Training
ZERO TO THREE is the only official source of training for DC:0β5.
DC:0β5β’: Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early ChildhoodΒ captures the latest scientific findings and clinical research on infant and early childhood mental health.
Contact us to learn more about infant mental health trainings and options for customized packages that meet your specific needs.Β
- The Infant Mental Health: What You Need to KnowΒ provides a foundational summary for professionals who work with infants and young children, available as a 90-minute webinar. The overview helps participants understand that infant and young children can experience mental health and developmentalΒ disorders, andΒ consider their own role-specific response to this information. Participants will gain familiarity with the background, approach, and content areas of DC:0β5.
- TheΒ DC:0β5 Clinical Training promotes an approach to diagnosis that centers culture and is developmentally sensitive and relationship-based. The infant mental health training focuses on the importance of using a developmentally sensitive, relationship-based, contextually grounded, and empirically supported system of diagnostic classification with children from birth through 5 years old.
- TheΒ DC:0β5 Certified Training-of-Trainers (ToT)Β prepares clinicians to deliver the ZERO TO THREE DC:0β5 Training curriculum to clinicians from fields of mental health, health, and early intervention who are responsible for diagnosis in their own sites or locales.Β TheΒ ToTΒ is available virtually or in-person.Β Clinicians who have successfully completed the DC:0β5 Clinical Training and who meet other eligibility criteria may apply to participate in the ToTΒ and pursueΒ ZERO TO THREE Trainer Certification.Β
- Community of Learners (CoL)Β eventsΒ promote participantsβ analysis, reflection, and exploration of applying content knowledge in their professional practice.Β Ninety-minuteΒ CoLΒ events can be provided virtually or in-person as follow-up to the DC:0β5 Clinical Training.Β CoLΒ participantsβ learning is enhanced through collaborative dialogueΒ with a focus on real-world application.Β
Interested in infant mental health training for yourself? Browse our upcoming DC:0-5 individual registration events.
The DC:0β5β’ 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:0β5β’: Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood (DC:0β5β’; ZERO TO THREE, 2016, 2021). It is designed to strengthen understanding of clinical disorders in infancy and early childhood, and to help infant mental health clinicians better understand the application of the multiaxial framework and culturally sensitive/relational approach to diagnosis that is fundamental to DC:0β5β’.

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