Morphometric evaluation.

Legend: The crown-rump length (CRL) was measured as the maximum distance from the cephalic pole to the caudal pole.The abdominal circumference (AC) was calculated by averaging the antero-posterior and latero-lateral abdominal diameters. Abdominal diameters were measured from a transverse section of the fetal abdomen at the level of the stomach and the umbilical vein.Occipital-snout length represents the distance from the occipital prominence to the mouth.Biparietal diameter is the distance between parietal bones and is easy to obtain by placing the electronic caliper on the hyperechogenic limit of the bones.Measurements of placental growth included placental length and placental thickness measured at the level of umbilical vessel insertion.