Resource
Yes, Mental Health Includes Babies
The perinatal period and a baby's first few years of life are critical for lifelong mental health.
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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. ZERO TO THREE is the only official source of training for DC:0–5.
The DC:0–5™ Manual is a professional mental health diagnostic manual for understanding and diagnosing mental health and developmental disorders from birth through age five. Formally titled DC:0–5™: Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood, the manual provides the diagnostic framework used alongside DC:0–5™ Clinical Training.
The DC:0–5™ Manual serves as the professional diagnostic reference, while DC:0–5™ Clinical Training helps qualified professionals learn how to apply its developmentally informed, multiaxial framework in practice.
ZERO TO THREE published its groundbreaking manual, DC:0–3 Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood
DC:0–5™ Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood captures new findings relevant to diagnosis in young children and addresses unresolved issues in the field
The updated DC:0–5™ Version 2.0 includes:
Need a little help justifying this infant mental health training to your supervisor?
DC:0–5™: Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood captures the latest scientific findings and clinical research on infant and early childhood mental health.
DC:0–5™ Clinical Training helps qualified professionals translate that framework into practice through developmentally informed, relationship-based, culturally responsive and contextually grounded approaches to assessment and diagnosis. This infant mental health training uses case-based learning to strengthen professionals’ understanding and application of the DC:0–5™ multiaxial framework.
Participants learn to consider and integrate:
The DC:0–5™ Certified Training-of-Trainers (ToT) prepares eligible clinicians to deliver the ZERO TO THREE DC:0–5™ Training curriculum to professionals in mental health, health and early intervention who are responsible for diagnosis in their own communities or organizations.
Clinicians who have successfully completed DC:0–5™ Clinical Training and meet additional eligibility criteria may apply for the ToT and pursue ZERO TO THREE Trainer Certification. The ToT may be offered virtually or in person.
ZERO TO THREE offers flexible training opportunities to help clinicians and other early childhood professionals strengthen their skills, deepen their knowledge of child development and stay current on relationship-based practices.
Not Sure Which Training Path Fits Your Needs? Professionals and organizations can contact ZERO TO THREE to learn more about DC:0–5™ and infant mental health training options, including customized training packages.
Community of Learners (CoL) events provide follow-up opportunities for professionals who have completed DC:0–5™ Clinical Training to analyze, reflect on and explore how they apply DC:0–5™ content in professional practice.
These 90-minute sessions may be offered virtually or in person and use collaborative dialogue to support real-world application of DC:0–5™ knowledge.

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 infant mental health clinicians better understand the application of the multiaxial framework and culturally sensitive/relational approach to diagnosis that is fundamental to DC:0–5™.
Learn more about our early childhood trainings and events.
DC:0–5™ Clinical Training is designed for mental health clinicians, psychiatrists, pediatricians, nurse practitioners and early intervention therapists who are qualified to provide mental health diagnosis. This may include licensed clinical social workers and other professionals whose work involves assessing and diagnosing infants and young children.
Yes. ZERO TO THREE is the only official source of DC:0–5™ training. Training is built around the DC:0–5™ diagnostic classification and helps professionals apply its developmentally sensitive, relationship-based and contextually grounded approach to infant and early childhood mental health.
Current DC:0–5™ Clinical Training listings are priced at $549 regular and $494.10 for ZERO TO THREE members. DC:0–5™ training cost and member pricing may change, so review the upcoming training listing for current pricing before registration.
Training format varies by offering. ZERO TO THREE provides virtual and in-person options within its DC:0–5™ professional learning pathways, including Training-of-Trainers and Community of Learners events. Review the current training listing for the format and participation requirements of a specific DC:0–5™ Clinical Training.
No. Completing DC:0–5™ Clinical Training is not the same as becoming a ZERO TO THREE Certified Trainer. Clinicians who successfully complete Clinical Training and meet additional eligibility criteria may apply for the separate DC:0–5™ Certified Training-of-Trainers (ToT) and pursue ZERO TO THREE Trainer Certification.
DC:0–5™ is designed specifically to support developmentally informed diagnosis for infants and young children from birth through age five. DSM-5 provides mental health diagnostic criteria across age groups, while ICD-10 provides standardized diagnostic terminology and codes. ZERO TO THREE’s DC:0–5™, DSM-5 and ICD-10 crosswalk helps professionals identify related diagnoses and terminology across the three systems.
Yes. ZERO TO THREE offers infant and early childhood mental health training for organizations and teams, with options for customized packages based on professional-development needs. Contact ZERO TO THREE to learn more about DC:0–5™ and broader infant mental health training options for your organization.

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