There is no relationship between a lateral incision in the first labor and whether or not the second labor will be cleft. If the lateral incision wound in the first delivery has healed and there is no infection, rupture, etc., then perineal laceration in the second delivery is not related to the previous lateral incision, and it is related to the size of the fetus in this pregnancy, the biparietal diameter of the fetal head, and the factors of the labor process. If the fetus of the second pregnancy is large, it may cause perineal tear during natural delivery; the biparietal diameter of the fetal head is relatively large, and it is also easy to cause soft tissue laceration of the birth canal, and in these cases the vulvar laceration has nothing to do with whether there is a lateral incision in the first pregnancy. Generally speaking, if the fetus is large, especially if the head of the fetus is wide, a lateral incision will be made to prevent perineal tearing during normal labor. In addition, vaginal and perineal tears may also occur if the labor is not smooth during the birth of the second child, such as rapid or difficult labor. Generally speaking, after the perineal lateral incision is performed on the first child, the area heals naturally within a few weeks, at least one year before the delivery of the second child, so there is no relationship between the second child’s laceration and the first child’s lateral incision. Generally the perineal laceration in labor is related to the size of the fetus in this pregnancy, the biparietal diameter of the fetal head, and the factors of the labor process, etc. The midwife or the doctor will decide whether to perform a lateral incision or not according to the specific conditions of the mother and the fetus. Regardless of whether it is a lateral incision or a laceration, it is important to pay attention to local care during the puerperium so that the wound area can heal aseptically as soon as possible.