Healthy weight in children looks at the significance of keeping a healthy weight during childhood and how it affects long-term health and development. It begins by defining a healthy weight for children and then introduces crucial measurement methods including the body mass index (BMI) and growth percentile charts. The chapter then dives into the various elements that affect a child’s weight, such as genetics, diet, physical activity, and socio-environmental impacts. The debate emphasises the rising concern over childhood overweight and obesity, describing the origins, risk factors, and long-term health repercussions of excess weight. Practical solutions for maintaining a healthy weight are offered, with an emphasis on balanced eating, frequent physical activity, and the formation of beneficial lifestyle habits. The chapter also discusses the difficult topic of addressing weight with children, encouraging body acceptance, and minimising weight-related stigma. Interventions for overweight or obese children are investigated, with an emphasis on medical evaluation, behavioural techniques, and school- or community-based activities. The importance of parents, carers, and healthcare providers in instilling good behaviours is also emphasised, along with opportunities for additional assistance. The chapter finishes by arguing for a comprehensive, collaborative approach to encouraging healthy weight in children, ensuring that they acquire long-term behaviours for general well-being. This chapter serves as a complete resource for parents, carers, educators, and healthcare professionals who wish to understand and support appropriate weight control in children.