Placenta in the anterior and posterior wall are both normal attachment positions of the placenta, there is not much difference. Placenta implantation in the anterior or posterior wall is the normal attachment position of the placenta, usually does not affect the fetus, so there is not much difference. It is important to note that if the placenta is in a very low position, and the placenta is blocking the cervical opening (complete placenta praevia), the fetus will be difficult to be delivered, and will need to be delivered through surgery. Therefore, whether the placenta is in a normal position is a matter of clinical concern, while the anterior wall, posterior wall and lateral wall are the normal placental attachment position, there is no big difference, and there is no other effect on the fetus, so normal obstetric examination can be done.