We defined by RIA-methods content of thyroid hormones in whey of blood of the women with hypothyroidism and their newborn. The control was healthy women and their newborn children. Distinctions in contents hormones at healthy women and their children, but also at hypothyroid woman and children are found. The found distinctions testify about isolation of functioning thyroid systems of a mother and child. The correlation analysis of results permits to admit presence of the control at synthesis hormones in child organism by parent thyroid system.