Whether there is harm in preterm birth at 35 weeks depends on the specific situation. Medically speaking, as long as there are no complications with the mother and fetus, we can let nature take its course without intervention, because in principle, although babies over 34 weeks are premature, their heart and lung functions are already relatively mature and they can survive relatively well after birth. However, some preterm births are spontaneous, such as mothers of twins or mothers with premature rupture of membranes, and some mothers have intrauterine infections during pregnancy, which cause preterm births. In severe cases, sepsis may occur. There is another type of preterm labor called therapeutic preterm labor, where the doctor induces labor because the health of the mother or baby does not allow the pregnancy to continue. In this case, the doctor will make a comprehensive assessment, which means that if the baby is allowed to stay in the mother’s belly, the possible risks are greater than if the baby is allowed to come out early, so even if there is a risk of preterm labor after the baby is born, it is better than letting the baby stay in the mother’s belly.