The purpose of this study is to understand the relationships in the mother-placenta-child system in case of hematogenous thrombophilia and thrombotic state of readiness in pregnant women. Materials and methods. The research group consisted of 454 patients, was divided into two subgroups: the 1st subgroup included 225 women (pregnant and, subsequently, obstetric patients) and the 2nd subgroup included their 229 infants who were in the perinatal center of State Novosibirsk Regional Clinical Hospital. At 3-5 days of life 75 newborns from the 2nd sub-group underwent hemostatic system assessment. 42 healthy newborns from somatically healthy mothers (without thrombophilia) were included in the control group. The assessment of their hemostatic system was carried out to determine the performance of reference values. Results. The relationships between the health condition of newborns and hemostatic system disorders in mothers with thrombotic state of readiness, hematogenous thrombophilia, and morphohistological changes in the placenta were studied. The researchers analyzed labour and delivery records, pathomorphological examination of a placenta, neonatal records, and assessed the hemostatic system. A number of complications were detected during a gestational process and an early neonatal period. The correlation analysis has established a relationship in the mother - placenta - child system in a number of factors affecting children's health outcomes. To correct above mentioned abnormalities preventive measures can be taken. They allow to avert the development of perinatal complications in case of hematogenous thrombophilia and (or) thrombotic readiness.