If the lower edge of the placenta covers the cervical opening before 28 weeks of pregnancy, conservative observation is needed. If it is after 28 weeks, it is necessary to prolong the pregnancy by keeping the fetus in labor and terminate the pregnancy as early as possible by cesarean section. If the lower edge of the placenta covers the opening of the cervix before 28 weeks of pregnancy, it is called placenta previa and should be observed conservatively if there is no abnormal bleeding. This condition may move upward with the enlarging uterus and eventually grow into the normal placental position. You need to pay attention to keep a positive and happy mood, avoid too much worry, and should eat more fruits and vegetables to maintain nutrition. For the lower edge of the placenta covering the cervical opening after 28 weeks, placenta praevia is diagnosed. This is a dangerous condition and painless bleeding may occur. Foetal preservation therapy is required under the supervision of a doctor to prolong the growth of the fetus in the uterus and cesarean section is performed to terminate the pregnancy. When the lower edge of the placenta covers the opening of the cervix, you should consult a doctor and follow the doctor’s instructions. Usually need to pay attention to bed rest, avoid exertion or strenuous activities.