It is not normal for the placenta to reach level 2 at 31 weeks of pregnancy. the placenta enters level 2 at 31 weeks, suggesting that with the gradual growth of the month, there will be the possibility of placental aging, and there may be symptoms of preterm labor and hypoxia, so you should pay attention to this in your life. Normally, the placental maturity at 31 weeks of pregnancy should be grade 1. If the placenta of a pregnant woman matures too early, consider the existence of pregnancy complications, such as gestational hypertension, chronic nephritis, gestational diabetes, eclampsia and other conditions, the placental tissue cells appear at 31 weeks when the placenta maturity grade 2 occurs due to obstructed blood flow and hypoxia, thus necrosis. Pregnant women with premature placenta maturation need to cooperate with doctors for relevant examinations to clarify the cause of premature placenta maturation and stop the deterioration in time. If complications are caused, then active treatment of the complications and standardized treatment are needed. 31 weeks when placenta maturity grade 2 appears, the fetal movement should be monitored and once abnormal fetal movement is found, timely medical attention should be sought.