It is possible to tear the original wound in the second pregnancy, but it is not absolute, it depends on the healing of the wound, but also depends on the size of the fetus and whether there is any difficult labor.
If the recovery from a first-trimester lateral incision is relatively good, and there is a long interval between the second and second births, and there is no difficult labor, there is usually no re-tearing. If the lateral incision heals poorly, or if there is a short interval between the first and second births, and there is a difficult labor in the second birth, it is possible to have a tear where the original lateral incision was made.
If you choose to have a normal delivery, it is recommended that you have a lateral perineal incision if the fetus is large, because a lateral incision wound is neat and heals well, while a non-lateral incision can easily cause a perineal tear, which is not neat and does not heal easily.
If there is a lateral incision during the delivery of the first child, and if the second child is born in a normal delivery, the need for a second lateral incision depends on the condition of the fetus, if the fetus is relatively large it is still recommended that a lateral incision be performed, if the fetus is not very large it can be done without a lateral incision, and the specifics of this can be evaluated by the doctor to make a decision. In late pregnancy, you should pay attention to appropriate activities, which is conducive to normal delivery.