We know that adult-child relationships, other early experiences, and environmental exposures influence child well-being. An increasing number of policies and programs around the world now reflect that understanding by supporting children’s early learning and nutrition to improve their readiness to succeed in school. As scientific knowledge continues to grow, we also know more clearly than ever how the conditions and environments in which children develop affect lifelong health as well as educational achievement. This guide has been translated into French with support from the Moving Minds Alliance.