Lower pregnancy means that the fetus is located in the lower abdomen of the pregnant woman, which is a folk saying and does not necessarily predispose to preterm labor. During pregnancy, if the main part of the fetus is located in the lower abdomen of the pregnant woman, it is called lower pregnancy, and if the main part of the fetus is located in the upper abdomen of the pregnant woman, it is called upper pregnancy. Upper and lower pregnancy refers to the position of the fetus in the mother’s body, and does not have a direct causal relationship with preterm labor, so it does not necessarily predispose to preterm labor. Preterm labor may be a manifestation of a pregnant woman’s exposure to a variety of causative factors such as life factors, environmental factors, emotional factors, fetal factors, maternal factors, and so on. If the preterm baby is more mature, it is more likely to survive. If the preterm baby is immature, the likelihood of survival is significantly lower.