The early years of brain development are arguably the most important of all in shaping a persons’ social, emotional, and relational faculties, yet so few people are aware that infant and preschool-aged children are just as able to suffer from mental health issues as adults. In this session, we examine what is known about the earliest years of brain development, and what can happen when that development is disrupted. We also take a look at attachment and the crucial role it plays in our very earliest years of life.