This briefing paper explores Infant and Early Childhood Mental Health (IECMH) policies and practices that state early intervention (Part C) programs may consider implementing to meet the social-emotional and mental health needs of infants and toddlers in the context of relationships with their parents and other caregivers.

Children's earliest experiences set the stage for school success and adult productivity. In the first three years of life, the brain grows at breakneck speed, creating more than a trillion pathways for learning and development. By the age of three, 85 percent of the brain's capacity is in place, creating the ability to speak, learn, and reason.…