Planking, generally referred to as the knee-chest position, is not necessary for pregnant women who are 34 weeks and 3 days old when the fetal position is corrected. The knee-chest position is used to correct breech presentation after 28 weeks. Breech presentation is the most common of the abnormal fetal positions and refers to the delivery of a fetus whose buttocks, knees or feet are the first to enter the pelvic inlet. Since the fetal head is larger than the fetal buttocks, a breech presentation is likely to result in a more difficult delivery of the subsequent fetal head and complications such as birth injuries, as the fetal buttocks are unable to dilate the birth canal well during a transvaginal delivery. The main methods to correct breech presentation before delivery are laser irradiation, knee-chest position, and external inversion. External inversion is used only when other methods are ineffective due to the risk of preterm labor, placental abruption, and umbilical cord entanglement. It is usually not necessary to continue lying down once the fetal position has been corrected, but too many changes in position are not recommended. Pregnant women with breech presentation are advised to take professional interventions in time before delivery and to have regular check-ups after the position is corrected.