There is some variation in the survival rate of 31-week preterm babies, depending on the specific condition of the preterm baby.
Most babies will survive if they do not have serious congenital diseases, but if they have a combination of serious congenital diseases, they are less likely to survive.
Common factors for preterm labor include maternal and placental factors. Most pregnant women with preterm labor have uterine anomalies or comorbidities, such as bicornuate uterus, longitudinal uterus, cervical insufficiency, gestational hypertension, gestational diabetes mellitus, gestational heart disease, severe malnutrition, etc. The fetal placental factors, such as anterior placenta, are not easy to survive.
Fetal-placental factors such as placenta previa and early placental abruption, multiple pregnancies, fetal malformations, chorioamnionitis, etc.
The fetus is mature at 31 weeks, if there is no serious fetal congenital disease, after regular neonatal emergency, most of them are able to survive, but need to enter the neonatal NICU after delivery to continue to grow.