16 weeks pregnant placenta leaning down need to pay attention to rest, prohibit coitus, on time to review the ultrasound and so on. When the ultrasound examination at 16 weeks of pregnancy suggests that the placenta is leaning down, it suggests that the edge of the placenta is close to or reaches the endocervical os, and those who are in stable condition should pay attention to appropriate rest, but it is not necessary to have absolute bed rest, not to have strenuous exercise, and it is forbidden to have coitus, and follow the doctor’s instructions to dynamically check the ultrasound to find out the changes in the position of the placenta. With the increase of gestational weeks, the enlargement of the uterus and the formation of the lower segment of the uterus, most of the mid-pregnancy ultrasound suggests that the position of the placenta is low will be moved to a normal position. However, when there is a history of multiple miscarriages and cesarean section and other high-risk factors of pregnant women may still indicate that the placenta is in a low position after 28 weeks of pregnancy, it is necessary to strengthen the management of pregnancy, timely obstetric examination, and according to the condition of the timely termination of pregnancy, in order to ensure the safety of mothers and infants.