It is not necessary to remove the placenta after a normal delivery, but if the placenta is still not completely clean after removal, then it is necessary to remove the placenta. If the placenta is still not delivered 30 minutes after the delivery of the fetus, or the vagina bleeds more, the placenta can not be delivered in time, then the placenta needs to be removed by hand, which is common in cases of uterine spasm, recurrent miscarriage with aura in early pregnancy, repeated abortions, placenta anomalies and so on, such as removing the placenta by hand to make sure that there is no residue in the uterus, then there is no need to remove the uterus, and if you suspect that there is a residue, then the uterus should be removed and treated. Failure to deliver the placenta in time is one of the common causes of postpartum hemorrhage, and in severe cases, it can cause shock and even endanger the life of the mother. If the placenta is left behind, it not only affects the recovery of the mother’s body and lactation, but is also easy to be infected with gynecological diseases. For those who have difficulty in delivering the placenta or suspect that the placenta has been retained, it is recommended to follow the doctor’s instructions for postnatal review after delivery.