Inclusion criteria  Singleton pregnancy Full term (>37 weeks) Cephalic presentation Reactive NST (nonstress test) Absence of spontaneous uterine contractions No contraindications to vaginal delivery  Exclusion criteria  Multifetal pregnancy Fetal malpresentation Preterm delivery (<37 weeks) Advanced maternal age (>40 years) Bishop score > 7 Fetal macrosomia ( >4500 gr) Non reassuring NST (nonstress test) Suspected chorioamnionitis Previous cesarean delivery or other uterine surgery