During which phase of labor does "crowning" occur?

Crowning occurs during the second stage of labor, which is characterized by the descent and delivery of the baby. During this stage, the baby's head begins to emerge from the vaginal opening, and when the widest part of the head becomes visible at the vaginal introitus, it is referred to as "crowning." This indicates that the baby is very close to being delivered.

The first stage of labor involves the onset of contractions and the gradual effacement and dilation of the cervix, but it does not include the baby's descent. The third stage of labor is the period following the birth of the baby, during which the placenta is delivered. The transition stage is a part of the first stage and refers to the period just before complete dilation, but crowning specifically happens when the baby is being delivered, solidifying the association with the second stage. Understanding the phases of labor helps in recognizing the significant milestones during childbirth.