The textbook is aimed at a comprehensive study and development of knowledge on one of the most important medical and social problems - food intolerance in children. The material introduces students and doctors to the features of diagnosing pathogenetically different clinical manifestations of food allergy, prevention tactics and elimination diet therapy in children of the first year of life. The most frequent mistakes of practical doctors in the management of this category of children are discussed. The work is intended for students on the main professional educational programs of higher education - training of highly qualified personnel on residency programs on specialties Pediatrics 31. 05. 02, General medical practice 31. 08. 54.