At the beginning of the uterine contraction, as referred by the patients and revealed by the electro-physiological signals recorded, the midwife/MD, if necessary, inflated 30-50 mmHg of air pressure into the lateral chambers of the inflatable belt to correctly align the fetus avoiding his malpositioning with respect to the pelvis. After monitoring the duration of spontaneous uterine contractions, the midwife/MD therefore inflated from 80 to 150 mm/Hg (for the Study Group) or from 10 to 20 mm/Hg (for the Control Group) of air into the ergonomic belt for 30 sec. Fundal pressure was applied at a 30-40° angle to the spine in the direction of the pelvic outlet through the inflatable belt, standardizing the force and surface area of application (980 cm2). The frequency of inflation was limited to fewer than 6 times per 20 min. followed by a pause of 10 min. All the women, whether randomized to the Study or the Control group, received standard management of the second stage of labor, which includes one-to-one support, fetal heart rate monitoring, and care from midwife. Operative deliveries were performed if clinically indicated. As a uterine contraction started, the inflatable obstetric belt was inflated synchronously and maintained at the pressure above indicated for 30 sec. by the midwife/MD. The Baby-guardTM was not used for more than 2 hours till delivery. The obstetrician, the midwife and the patients were blind to whether the belt was inflated with sufficient pressure (from 80 to 150 mm/Hg for the Study Group) or not (from 10 to 20 mm/Hg for the Control Group).