The survival rate of preterm infants at 30 weeks, which can reach more than 50 percent, is due to the fact that at this time the parenchymal organs are well developed, there is less fat deposition throughout the body, and the lungs are not particularly mature. If a woman is born at 30 weeks of pregnancy due to premature rupture of the fetal mold, or placenta abruptio, or even placenta praevia, she must undergo a cesarean section to terminate the pregnancy, or if the uterus has regular contractions due to other causes and the opening of the uterus is wide, and the baby must be delivered in normal labor, then the fetus born at this time is called a premature baby. Because of the small gestation period, the fetus is born with immature fetal lung development and less body fat, and its resistance is particularly weak, so it often needs to survive in the incubator to have a chance of survival. If allowed to survive in the natural in the outside world, often leads to aspiration pneumonia in newborns, and even cause other bacterial infections, and lead to fetal death, so then it is necessary to enter the incubator. The survival in the incubator is not always 100% viable, because the gestational week is small and the cost is large, so not every family can afford the associated costs. So after the fetus is born at 30 weeks, if conditions allow, it may need to stay in the incubator for about two months so that it can survive in the outside world properly.