“…Thus, the average mortality rate from SIDS per 1000 births is: in Japan -0.25, the Netherlands -0.3, Russia -0.4, Great Britain -2.3, Germany -1.6, Austria -1.0, Italy -0.5, the USA -2.8, in Russia -0.43 per 1000 children [2]. In Kazakhstan, the infant mortality rate in 2021 was 8.41, but the data on deaths of children from SIDS were not allocated to a separate category [3].Thymic-lymphatic status (Latin: Status Thymico-Lymphancus) is a condition of the body characterized by pathological hyperplasia of the thymus gland or in combination with generalized hyperplasia of the entire lymphoid tissue, including lymph nodes, palatine tonsils, spleen, as well as atrophic changes in the adrenal glands, causing sudden death from influences whose strength is inadequate to a fatal outcome [4]. Thymic-lymphatic status was the background of the underlying disease, contributing to the development of sudden death syndrome [5,6].…”