In this training guide on the professional practice, modern ideas on the formation of children's and adolescents' health, normative documents in the field of children's and adolescents' hygiene, children's health in children and importance of adolescent hygiene, methods of studying indicators characterizing the health status of children and adolescents, methods of anthropometric examination, development of standards for assessing the physical development of children and adolescents, promotion of a healthy lifestyle in children's institutions, nutrition of children and adolescents, hygienic requirements for children's household items, hygienic principles of architectural and planning solutions, activities of children's and adolescent institutions, national interests of children, organization of hygienic education approach, etc.