What happens during the first stage of labor?

During the first stage of labor, the process of childbirth begins with uterine contractions that lead to changes in the cervix. Specifically, it involves the onset of regular contractions, which cause the cervix to gradually efface (thin out) and dilate (open) in preparation for the delivery of the baby. This stage is crucial as it lays the foundation for the subsequent stages of labor.

The dilation of the cervix continues until it reaches full dilation, which is typically about 10 centimeters, allowing for the baby's passage through the birth canal. This stage can be divided into early labor, active labor, and transition, marking the progression towards delivery. Understanding this stage is essential for recognizing the timing and management of labor.

The other options present different aspects of childbirth; however, they do not accurately define the first stage of labor. The delivery of the baby occurs in the second stage, the positioning of the baby is part of the overall labor progression that may involve different stages, and monitoring the mother's vital signs, while important throughout the labor process, is not exclusive to the first stage.