Final answer:
Labor has three stages: cervical dilation, expulsion of the baby, and afterbirth. Synthetic oxytocin can be administered to restart and maintain labor if it stops before stage two.
Step-by-step explanation:
During labor, there are three stages: cervical dilation, expulsion of the baby, and afterbirth. In stage one, the cervix thins and dilates to about 10 cm. In stage two, the baby is expelled from the uterus. In stage three, the placenta is passed. If labor stops before stage two, synthetic oxytocin, known as Pitocin, can be administered to restart and maintain labor.