Placenta level 1 is normal at 39 weeks of gestation. Under ultrasound, the placenta is classified into level 0, level 1, level 2 and level 3 according to the maturity of the placenta. Grade zero placenta indicates that the placenta is immature, grade three placenta indicates that the placenta is vascularly calcified and has poor ability to deliver nutrients to the fetus, and grade one placenta indicates that the placenta is nearly mature and has very strong ability to supply blood, oxygen and nutrients to the fetus. Pregnant women do not need to worry about the poor function of the placenta causing fetal hypoxia, the level and maturity of the placenta has no great relationship with delivery, the first degree placenta can be delivered, while the third degree placenta can wait for several days before delivery, pregnant women need to do regular and regular maternity checks during pregnancy, and count fetal movements at home.