In the case of a partial separation, bed rest and close monitoring may be prescribed if the pregnancy has not reached maturity. In some cases, transfusions and other emergency treatment may be needed as well.
In a case with a total or complete separation, delivery is often the safest course of action. If the fetus is stable, vaginal delivery may be an option. If the fetus is in distress or the mom is experiencing severe bleeding, then a cesarean delivery would be necessary.
Unfortunately, there is no treatment that can stop the placenta from detaching and there is no way to reattach it.