It is impossible to tell which is better for a pregnant woman as both a mild tear and a lateral incision are damaging to the birth canal, and both should be avoided as much as possible during labor. However, when unavoidable, a lateral incision is better for primigravida or if the fetus is too large, and a mild tear is usually better for a gravida. When the mother is a primigravida or the baby is too large, it is relatively difficult to stretch the perineum, which is usually tight and may lead to a severe perineal tear, making labor more difficult. In this case, a lateral incision is needed to assist the delivery of the fetus and to avoid the risk of asphyxiation in case of severe tearing or if the fetus remains undelivered for too long, which is why a lateral incision is better for the pregnant woman at this time. In the case of menstruating women, the perineum is usually more relaxed and the fetus can be delivered more easily, so the possibility of severe tearing is unlikely, and there is no need for a lateral incision. Mild tears are relatively small and are more suitable for women in labor. To summarize, which is better, mild tear or lateral incision, needs to be judged according to the situation of the pregnant woman, and it is recommended that the patient undergoes regular checkups before delivery, and the specific situation is subject to the doctor’s advice.