The mental health of children is a current concern, and this applies even to the earliest years of a child's life. This book supports trainees and practitioners working in early years contexts to understand the risk factors which can result in the development of mental health needs in children from birth to 5. It argues that high quality early years provision can mitigate against some of these risk factors and provides clear, evidence-informed guidance around government policy, transitions, attachment and working with parents or carers.