In the study group (ultrasound evaluation at 35-35+6 (6 / 7 days weeks)), the ultrasound evaluation will include biometric parameters of the fetus: cephalic perimeter, biparietal diameter, abdominal circumference and femur length. Based on these measurements, the computer system (Astraia) provides the estimated fetal weight and respective percentile according to the Hadlock formula. Amniotic fluid will also be measured (maximum column). Functional evaluation will include: Doppler of the umbilical artery, middle cerebral artery and Uterine arteries. The respective index of pulsatility and cerebroplacental ratio will be registered. All Doppler evaluations will be performed in the absence of somatic and respiratory fetal movements, under transitory maternal apnea, with the lowest insonation angle possible and at least 3 successive complexes will be evaluated for each measurement.