Placenta grade 2 at 36 weeks of pregnancy is normal. The placenta maturity is divided into four levels, level 0, level 1, level 2 and level 3. level 1 marks the basic maturity of the placenta, which occurs between 30 and 32 weeks of pregnancy; level 2 marks the maturity of the placenta, which occurs after 36 weeks; level 3 marks the aging of the placenta, due to calcification and fibrin deposition, which reduces the ability of the placenta to deliver oxygen and nutrients, generally after 38 weeks the placenta enters level 3, and if necessary, it is necessary to If necessary, the fetus should be delivered in time to avoid intrauterine hypoxia. If placenta grade 3 occurs before 37 weeks, the placenta is considered premature and the possibility of intrauterine growth retardation should be alerted.