Each year, millions of children in developing countries fall sick and die from diseases caused by polluted air, contaminated water and soil, and poor hygiene behavior. These infections lead to repeated infections contributing to malnutrition in children, and subsequently impacts future learning and productivity. This book analyzes the linkages between environment-related infections and malnutrition and their impact on child growth and development; assesses the related burden of disease on young children and its economic costs; and highlights experiences in implementing environmental health interventions in developing countries.