Using ultrasound-Doppler-system UBD 2 the pulsation curves of mean blood velocity and mean flow of anterior cerebral artery have been registered and examined. In 95 healthy newborns (mean age 36th to 41st gestational week) normal values and correlation for age have been determined for transit time as parameter independent from curve shape and pulsatility index and peripheral resistance index as parameters of curve form. Position test enables testing the autoregulative function of cerebral hemodynamic under physiologic conditions. This shows a postnatal ripening within the first five days of live.