The Early Childhood Mental Health Support Act aims to enhance the mental health and well-being of children enrolled in Head Start programs. It focuses on identifying and implementing effective strategies to improve social-emotional and behavioral health among young children, as well as supporting the wellness of staff working in these programs. The key provisions of the Act require the Secretary of Health and Human Services to identify and review evidence-based interventions, best practices, and training programs that can be applied in Head Start and Early Head Start settings.