This new edition includes significant and extensive changes throughout to provide current information. New chapters are included, surgical chapters have been combined (with the exception of cesarean delivery), and the anatomy chapter has been replaced with an appendix. New chapters covering placental anatomy and physiology, non-invasive prenatal diagnostic techniques, abnormal labor, operative vaginal delivery, cervical incompetence, amniotic fluid disorders, thrombophilias, and thromboembolic disorders.