The placenta level 3 at 37 weeks of pregnancy indicates that the placenta is mature and suitable for delivery, but the placenta maturity is only one of the rough indicators to judge the growth of the fetus in the uterine cavity, and cannot be used to judge the time of delivery, and the exact time of delivery needs to be judged in conjunction with other conditions. At 37 weeks of pregnancy, placenta level 3 is normal, because with the increase of gestational weeks, placenta maturity gradually increases, but at the same time, it means that placenta function starts to gradually age, because the ability of placenta to transport oxygen and nutrients decreases, pregnant women need to be alert to fetal growth retardation or lack of oxygen. In this case, pregnant women should pay attention to the maternity checkup, regularly check the health condition of the fetus, if there is hypoxia, it is recommended that the pregnant women should take the right amount of oxygen and pay attention to the combination of work and rest, if the situation is serious, it is necessary to consider terminating the pregnancy as soon as possible. The maturity of the placenta is not proportional to the time of delivery, so the time of delivery cannot be judged simply based on the maturity of the placenta. The specific time of delivery is related to the condition of the fetus and the pregnant woman and the expected date of delivery, which varies from person to person. Generally, pregnant women will give birth at full term, and 37 weeks of pregnancy is already at full term, so there is a possibility of delivery at any time, so pregnant women should pay attention to observe their body condition, if the amniotic fluid ruptures, there are regular contractions or vaginal bleeding, it means that the fetus is about to give birth, so you need to go to the hospital as soon as possible to wait for delivery.