Experiences by continuous ultrasonic measurements during pregnancy. The authors have published earlier a diagram for use to evaluate the fetal development. The aptitude in practice has been proved.--To evaluate normal fetal growth the percentiles curves of Lubchenco are less suitable than of the GDR. But also the last show the normal weight 100 to 150 g to small during the 30th to 36th gestation week in comparison to the calculated fetal weight of normal pregnancies. The intrauterine retardation and hypertrophy can well be diagnosed if the beginning of the measures occurs at the end of the first trimenon of the pregnancy. But it is necessary to know the possibilities of apparent "abnormalities" in normal pregnancy, as ceccation of the fetal growth for 3 or 4 weeks, the late flattening of the biparietal diameter in breech presentation etc.--Our effort to simulatae the fetal growth in intrauterine retardation by using beta-stimulating sympathicomimetics, was without of success.