At 31 weeks of pregnancy, induction of labor is not legally permitted if the fetus is developing normally. Labor may be induced if the fetus has a lethal disease or if the pregnant woman has a serious illness that prevents her from continuing the pregnancy. A woman who is 31 weeks pregnant is not allowed to induce labor even if she wishes to do so, but the fetus is developing normally. It is permissible to induce labor if the fetus has a serious congenital anomaly which will affect the life of the fetus, or if the pregnant woman has a serious illness that prevents her from continuing the pregnancy, and if the pregnancy continues, the life of the pregnant woman may be jeopardized. In addition, if the function of the placenta is seriously impaired and the fetus has hypoxia problems and cannot continue the pregnancy, it is necessary to induce labor as early as possible to terminate the pregnancy to prevent any threat to the life of the fetus and the pregnant woman. Whether labor can be induced at 31 weeks should be decided according to the physical condition of the fetus and the pregnant woman. It is recommended that the pregnant woman should go to the hospital and choose the correct treatment under the guidance of the doctor.