Placental maturity is related to the week of gestation and fetal development and diseases. The placenta belongs to fetal appendages, plays an important role in maintaining the growth and development of the fetus in the uterus, and is the place where nutrients are exchanged between the fetus and the mother. The function of the placenta directly affects the development of the fetus in the uterus. If the placenta functions well and the fetus absorbs nutrients well, it suggests that the development of the fetus is normal. 1. gestational week and fetal development: placental maturity with the gestational week and fetal development is divided into 0 level of the placenta, the first level of the placenta, the second level of the placenta, the third level of the placenta. 28 weeks before the placenta is in the 0 level, 28-36 weeks of the placenta is in the Ⅰ – Ⅱ level, if close to the expected date of delivery, that is, 40 weeks of pregnancy, the placenta is in the Ⅱ – Ⅲ, the placenta Ⅲ marking the beginning of the placenta towards aging. 2. Disease: If the pregnant woman suffers from kidney disease, diabetes, hypertension, etc., it may lead to low maturity of the placenta affecting the supply of nutrients to the fetus, resulting in abnormal development of the fetus. If abnormal placental maturity occurs in late pregnancy, you need to go to the hospital in time.