As noted above, the most decisive way to prevent postterm pregnancy is induction of labor prior to 42 weeks’ gestation. However, since complications rise during 40 and 41 weeks' gestation and both clinicians and patients are concerned about the risks of induction of labor, it is perceivably better for women to go into spontaneous labor at 39 weeks of gestation on their own. Several minimally invasive interventions have been recommended to encourage the onset of labor at term and prevent postterm pregnancy, including membrane stripping, unprotected coitus, and acupuncture.