We'd all love to be able to predict the future, especially when it comes to how a baby will be born: by vaginal, operative, or cesarean delivery. A cesarean delivery after labor is significantly more likely to lead to complications like hemorrhage or infection than a scheduled cesarean delivery. However, for the average low-risk woman, a spontaneous vaginal delivery is safer than any cesarean delivery. Obstructed (or stalled) labor is one of the largest contributors to our rising cesarean delivery rate. Therefore, predicting which women will ultimately need a cesarean delivery for obstructed labor could potentially lead to more effective care and possibly fewer complications. One approach to predicting mode of delivery is by analyzing the pelvic muscles as viewed through ultrasound.