Which stage of labor is defined by the complete dilation of the cervix?

The complete dilation of the cervix marks the transition from the first stage of labor to the second stage of labor. The first stage encompasses the period from the onset of labor until the cervix is fully dilated to 10 centimeters, which includes both the latent and active phases. Once the cervix is completely dilated, the second stage begins, characterized by the mother actively pushing as the baby is delivered through the vaginal canal.

In this context, the second stage is focused on the descent and birth of the fetus, indicating its significance in the overall labor process. Understanding this distinction is crucial for anyone studying obstetrics, as it helps identify the progress of labor and the appropriate interventions that may be required.