At about 4 months a needle is inserted through the mother's abdomen, into the chest and heart of one of the fetal babies and a poison injected to kill him or her. It is done to reduce the number or to kill a handicapped baby, if such is identified. If successful, the dead baby's body is absorbed. Sometimes, however, this method results in the loss of all of the babies. These are done after 4 or 5 months.
Most babies are viable.
This is like a breech delivery. The entire infant is delivered except the head. A scissors is jammed into the base of the skull. A tube is inserted into the skull, and the brain is sucked out. The now-dead infant is pulled out.