Standards and competencies are critical structural supports for any professional workforce, including early childhood professionals. Workforce capacity building, career progression, and career longevity can be supported by the foundation of consistent competency expectations. Defining and embedding consistent, evidence-based competencies is a foundational step in realizing significant, sustainable improvements to infant–toddler services. Competencies can help build awareness, readiness, and capacity to change, and support exploration and adaptation in professional practice. ZERO TO THREE defined and provides competency-based education to advance effective early childhood services. (author abstract)