Lateral incision is generally not required for normal labor, and only in a few cases of obvious abnormalities may a lateral incision be required to assist in normal labor. During labor, the fetus descends into the vagina, and if the fetus is of the right size, the birth canal of the pregnant woman is wide and free of malformation, the descent of the fetus is not significantly impeded, and the fetal heartbeat is good during labor. If both parties are in good health, a normal delivery at this time usually does not require a lateral incision. If the fetus descends to the vagina, but the fetus is large and the vagina of the pregnant woman is not conducive to the descent of the fetus and there is some obstruction to it, or the fetal heart rate is abnormal and other cases with indications of lateral incision, then lateral incision is needed for delivery. Pregnant women need to be guided by a specialized doctor to choose the appropriate mode of delivery for themselves.