Healthy nutrition is a core area of pediatrics. The foundation for the healthy development of children and adolescents is the supply of nutrients tailored to their needs. Due to the lack of systematic education, there are often knowledge gaps in dietetics, clinical nutrition, and infusion therapy that need to be addressed to meet the complex demands of pediatric practice. This guide summarizes the fundamentals and therapeutic approaches in a practical manner and supports pediatricians in successfully implementing strategies for healthy nutrition, dietetics, and infusion therapy. The significantly expanded second edition presents the content of the specialized training in nutritional medicine in a structured way, focused on pediatric patients, according to the curriculum of the Federal Medical Association. The content is aligned with the certification in nutritional medicine from the German Society.