An ultrasound in the third trimester is also extremely important, as the doctor determines how the delivery will proceed. In addition, it pursues the following goals:
• determination of the position and presentation of the fetus. The position in which the baby will be will not change until birth. The method of delivery will depend on it and on the presentation. So, with a longitudinal position and a normal cephalic presentation, this is a natural birth; with a transverse or oblique position and a pelvic presentation, this is a cesarean section;
• assessment of the size and weight of the fetus;
• assessment of the size, maturity and location of the placenta;
• assessment of the quantity and quality of amniotic fluid.