1. Method for automatically measuring a fetal artery, and in particular the abdominal aorta, characterized in that it comprises: a step for acquiring and storing at least one sequence of images of the fetal abdomen by means of an ultrasonographic device; a step for the approximate identification of the fetal artery, and in particular of the abdominal aorta, by means of a bank of directional filters, obtaining an approximate image of the fetal artery and in particular of the abdominal aorta; a step for the fine identification of the walls of the fetal artery and in particular of the abdominal aorta, starting from said approximate image of the fetal artery and in particular of the abdominal aorta, in each image of said sequence of images by means of a calculation model based on the active contours, obtaining sequences of segmented images; a step for measuring the diameter and/or the corresponding intima-media thickness of the fetal artery and in particular of the abdominal aorta, conducted at one or more segmented images.