Relevance. Public health is one of the topical areas of scientific research. In the context of the demographic crisis, the study of the health status of the child population is of particular interest to researchers. The most common in children are diseases of the skin and subcutaneous tissue, which are a multidisciplinary problem and a manifestation of pathological processes occurring in the internal organs, or caused by external factors. One of the urgent problems in childhood was atopic dermatitis and the prevention of its development. To organize adequate medical care for children suffering from atopic dermatitis and prevent its development, it is important to study the causes and age of development of atopic dermatitis. Purpose of the study: to study the causes and age-related features of the development of atopic dermatitis in children. Material and methods. The data of form No. 025/y-04 “Medical record of an outpatient patient”, form 003/y “Medical record of an inpatient patient” and the results of farrowing of patients and their mothers were used. The study group included 350 children who received medical care in inpatient and outpatient settings at the Republican Children's Clinical Hospital of the Ministry of Health of the Udmurt Republic and the Republican Dermatovenerological Dispensary of the Ministry of Health of the Udmurt Republic for atopic dermatitis. The work used analytical, statistical (calculation of intensive and extensive indicators) research methods and the method of descriptive statistics. Results. It has been shown that atopic dermatitis often develops in the first year of a child's life, which is associated with the introduction of complementary foods, a violation of the diet by the breastfeeding mother, less often during acute illnesses, after preventive vaccinations. The most frequent debut of the disease can be traced from 3 to 6 months of a child's life. The organization of medical care depends on the severity of the course of the disease, which is determined by the values of the SCORAD index, and in order to prevent the development of atopic dermatitis in children, it is necessary to increase the awareness of parents about the causes of the development of the disease. Discussion. Diseases of the skin and subcutaneous tissue have a multifactorial nature of development, and therefore arouse the interest of specialists in various fields. This contributes to the development of new technologies for providing medical care to patients. For example, thanks to the participation of allergologists and immunologists, it is possible to avoid the severe course of atopic dermatitis, or to prevent relapses of the disease, which improves the quality of life of patients. Conclusion. The results of the analysis of the incidence of atopic dermatitis in the child population showed that one of the most common causes of the development of atopic dermatitis is a violation in the diet of nursing mothers and the introduction of complementary foods, which indicates their low awareness of the causes of the disease.