This legislation, titled the Early Childhood Mental Health Support Act, directs the Secretary of Health and Human Services (HHS) to identify and review evidence-based interventions, best practices, curricula, and staff trainings. The primary goal is to improve the behavioral health and support the healthy social, emotional, and cognitive development of children in Head Start and Early Head Start programs. These interventions must be deliverable by program staff, demonstrate effectiveness across diverse populations, and incorporate trauma-informed care approaches. The Secretary is also tasked with identifying interventions that support staff wellness and self-care . The identified practices should offer a tiered approach to addressing need, including: universal interventions for all children; selected prevention for children with increased need; and indicated prevention for children with substantial need. HHS must consult with relevant experts and solicit public input during this identification process, with initial reviews completed within two years and updated every five years. Following identification, the Assistant Secretary for the Administration for Children and Families will award grants to Head Start agencies across diverse geographic areas to implement these interventions. Concurrently, HHS will establish a method to evaluate whether these implemented interventions achieve anticipated effects and yield long-term savings , with initial determinations made within two years and updated regularly. This evaluation process will also include public input. The bill further establishes a voluntary mechanism for Head Start programs to evaluate their implementation of these interventions, providing guidance and technical assistance to grantees. It also authorizes the funding of up to five Best Practice Centers in universities and colleges to prepare future Head Start staff. A total of $100,000,000 is authorized for appropriations from fiscal years 2027 through 2036 to support these implementation, evaluation, and training efforts.