The chances of manual expulsion of fetal membranes are extremely low.
The normal course of labor consists of three stages, including dilatation of the cervix to the point where the uterine opening is complete, i.e., the opening of the 10 fingers, the second stage of labor, which involves the delivery of the fetus, and the third stage, which involves the delivery of the placenta. The third stage of labor is the delivery of the placenta. Manual abruption of the membranes may occur during the third stage of labor.
About 30 minutes after the delivery of the baby, there are some uterine contractions in order to expel the placenta-membrane, which usually happens on its own after the baby passes through the birth canal.
However, there is a very low probability that the placenta will need to be removed manually, for example, if the woman is weak and the labor is too long or if the uterus is cramping and the contractions are weak, the placenta membranes will not be able to be delivered and will remain in the body, so the doctor will need to put his hand into the uterus to remove them from the uterine wall.
The probability of such manual removal is extremely low. The procedure should be performed by a specialist in an authorized hospital.