Main fetal echobiometric parameters have been considered in 643 pregnant patients and evaluated for fetal macrosomia predictivity. Deliveries occurs within seven days after ultrasound examination. Malformative or other pathologic conditions with could have interfered with a correct ultrasound evaluation of the disease have been excluded. The single parameters are not reliable for a screening of fetal macrosomia. The A. suggest, for a greater accuracy, sequential ultrasound examination during pregnancy or mathematical correlation of several echobiometric parameters.