What defines the first stage of labor?

The first stage of labor is characterized by the onset of regular contractions which lead to significant cervical changes until full dilation is achieved. This stage is divided into two phases: the latent phase, where contractions are typically less intense and more irregular, and the active phase, where contractions become more frequent and intense, resulting in more rapid cervical dilation.

During this stage, cervical changes are critical, as they indicate the body's preparation for the delivery of the infant. The culmination of the first stage occurs when the cervix is fully dilated to 10 centimeters, marking the transition to the second stage of labor, which involves the pushing and delivery of the infant. Understanding the specifics of these phases helps health care providers to better assess the progress of labor and provide appropriate care to the laboring individual.