During which stage of labor does the cervix dilate from 4 to 7 centimeters?

The correct choice is the active labor stage, which is characterized by the cervix dilating from 4 to 7 centimeters. Active labor typically follows the early labor phase, where the cervix undergoes a more rapid and pronounced dilation. During active labor, contractions become more intense, frequent, and regular, which promotes the further dilation of the cervix. This stage is crucial as it indicates that the woman is progressing in labor and moving closer to delivery.

In contrast, early labor involves the cervix dilating from 0 to about 4 centimeters, where contractions may be irregular and mild. Transitional labor occurs after active labor and is marked by the final dilation from 8 to 10 centimeters, leading to the pushing stage. The postpartum stage refers to the period after childbirth and does not involve cervical dilation. Understanding these stages is essential for providing appropriate care and monitoring during labor.