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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.
分娩全程可分為三個(gè)階段，每個(gè)階段因受產(chǎn)婦和其他因素的影響均不相同。將第一產(chǎn)程潛伏期和活躍期。在潛伏期，宮頸變?。ㄗ訉m頸薄化），宮口擴(kuò)張至3cm。這一過(guò)程需要數(shù)小時(shí)或者幾天。
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.
第二產(chǎn)程需數(shù)分鐘到數(shù)小時(shí)。在第三產(chǎn)程，在胎兒娩出后不久，胎盤(pán)娩出。第三產(chǎn)程，又叫胎盤(pán)娩出期，通常在胎兒娩出十分鐘內(nèi)發(fā)生。
