The dictum "Once a cesarean, always a cesarean" ruled for most of the
20th century.1 Nevertheless, in the 1970s a
small group of women who had prior cesarean deliveries were eager to experience
vaginal birth and risked a trial of labor (a purposeful attempt to permit
active labor development with progression to vaginal delivery).2
Success in such cases led the National Institutes of Health in 1981 to promote
trial of labor for patients who had previous cesarean deliveries.2