Impact of Ultrasound Fetal Weight Estimation on Obstetrical Management and Maternal and Neonatal Outcomes

The investigators wish to study the obstetrical data of pregnant women who had an ultrasound estimation of fetal weight and who delivered at the University Hospital of Strasbourg over the last 20 years. These retrospectively collected data are a valuable source of scientific information since they are "real life data", currently of growing interest in the scientific community, and have a large volume and quality due to the number of years included and the variety of information collected in the computerized media records. From this study, the investigators hope not only to better understand the consequences of ultrasound screening for fetal growth, but also to improve its accuracy and to develop useful models in obstetrical decision making in order to decrease maternal and neonatal morbidity.