竖位分娩指宫颈开口期让产妇自由走动或站立、端坐的一种产位。采取这样的产位分娩对母婴都有好处。医学上把产妇的子宫从有规律收缩开始至子宫颈口全开这段时间称为宫颈开口期。在这期间内,子宫颈口要逐渐扩张到直径10公分左右才能使胎儿顺利通过。初产妇的宫颈开口期约需12小时,占总产程时间的 Stereotactic refers to the opening of the cervix to allow mothers to freely move around or standing, sitting in a production position. It is good for mothers and babies to take such delivery. Medically maternal uterine contraction from the beginning to the cervix full open this period of time called the cervical opening. During this period, the cervix to gradually expand to about 10 cm in diameter in order to make the fetus passed smoothly. The primiparous cervical opening period takes about 12 hours, accounting for the total labor time