Infant mental health refers to practices that support children’s social and emotional development from birth to three. Infant mental health is the key to responsive caregiving that supports both families and early childhood professionals and the development of healthy social and emotional behaviors in young children. In this workshop, we examine the six pillars of infant toddler mental health: social-emotional development; risk and resiliency; self-regulation; attachment; the continuum of supports for early mental health; and the importance of relationships and family culture. As early childhood professionals, we support children birth to 3, through a framework that builds on dynamic models of infant and toddler development. From attachment to adverse childhood experiences, we come to understand how the brain is both built and impacted by relationships. Join us as we reflect on practices to support children from birth to three years in forming secure adult and peer relationships, experiencing, managing, and expressing a full range of emotions, and exploring the environment and learning in building the brain.