The motor activity of the embryo is determined after 7 weeks of pregnancy. At first, these movements are very weak and isolated, barely noticeable during examination. Then, when differentiation into the head and pelvic ends of the embryo becomes possible, movements resemble flexion and extension of the body, then separate movements of the limbs appear. Since episodes of motor activity of the embryo are very short and count in seconds, and periods of motor rest can be significant in time, registration of the cardiac activity of the embryo is undoubtedly a more important criterion for assessing its vital activity.