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There are three stages of labor. Each of these stages varies according to the woman and many other factors.The first stage includes early labor, when the cervix thins (effacement) and begins to open (dilate) from zero to three centimeters. This stage may take hours or days.
分娩全程可分为三个阶段，每个阶段因受产妇和其他因素的影响均不相同。将第一产程潜伏期和活跃期。在潜伏期，宫颈变薄（子宫颈薄化），宫口扩张至3cm。这一过程需要数小时或者几天。
During active labor, the cervix opens further, and contractions become stronger and more frequent. Transition follows with the cervix becoming fully dilated to ten centimeters, and the second stage of labor begins. Contractions in this stage become stronger as the baby is pushed down the birth canal. The head crowns (is seen from outside), and the baby is finally delivered.
第二产程需数分钟到数小时。在第三产程，在胎儿娩出后不久，胎盘娩出。第三产程，又叫胎盘娩出期，通常在胎儿娩出十分钟内发生。
