Placental maturity grade 1 at 40 weeks pregnant is more than normal. Placental maturity level I at 40 weeks of pregnancy, if the checking gestational week is accurate, indicates that the function of the placenta is okay and the degradation is not very serious. The maturity of the placenta does not determine the time of birth of the fetus, but for pregnant women with low placental maturity, the nutritional supply of the fetus in the uterine cavity is more adequate, and it is not easy for the fetus to suffer from hypoxia because of the aging of the placenta. Under normal circumstances at 40 weeks of pregnancy, the fetus is already full-term, at any time there is the possibility of delivery, it is recommended that women at 40 weeks of pregnancy at any time to be ready for delivery, try not to go out alone or travel far. If there is no abnormality 1 week after the delivery, if there is abdominal pain, vaginal bleeding, fluid or abnormal fetal movement, you need to go to the hospital in time to wait for delivery.