Objective — to develop a sonographic criterion for prognostication and prevention of intranatal hypoxic-ischemic fetal brain injuries in order to reduce perinatal morbidity and mortality associated with birth traumatism. Material and methods. The study contained 30 pregnant women, including 10 pregnant women at 38—39 weeks of gestation, 10 patients at 39—40 weeks of gestation, and 10 pregnant women at 40—41 weeks of gestation. In order to reveal a sonographic criterion for the prevention of fetal birth traumatism in full-term pregnancy in patients of the study group, an ultrasonic linear measurement of the distance between the convex surface of the fetal cerebral cortex and internal surface of the parietal and frontal bones was carried out in the parasagittal plane of the fetal parietal region by a C8—4V transvaginal sensor of a Philips HD11 XE apparatus. Results. The performed studies in women with full-term pregnancy have demonstrated that the distance between the convex surface of the fetal cerebral cortex and internal surface of the parietal bone by linear measurement in the parasagittal plane of the parietal region with the use of a C8—4V sensor of a Philips HD11 XE apparatus, corresponding to 3.58±0.05 mm at 38—39 weeks of gestation, 2.12±0.06 mm at 39—40 weeks of gestation, and 1.83±0.05 mm at 40—41 weeks of gestation, according to preliminary data, have a great importance, because they make it possible, during the antenatal period, to prognosticate intranatal birth trauma of ishemic genesis and to choose in good time a mode of delivery. Conclusion. The importance of the distance between the convex surface of the cerebral cortex and the internal surface of the fetal parietal bone at linear measurement in the parasagittal plane of the parietal region can be supposed to be a sonographic criterion of the prognosis of an intranatal fetal birth trauma in full-term pregnancy, as well as makes it possible to prevent fetal birth traumatism in the pre-delivery period. At the same time, the preliminary findings of this study require further investigation and confirmation.