妊娠40周时，胎儿发育成熟。成熟的胎儿及其附属物（胎盘、股膜、脐带、羊水）排出体外的过程称为分娩。在一些人的印象里，似乎孩子生得快是件好事，为分娩顺利的标志。其实，这种看法并不正确。分娩过程决不是“快速战”，初产妇全部产程约需13-18小时，经产妇也需7-10小时。 Forty weeks of gestation, the fetus develops well. Mature fetus and its appendages (placenta, femoral, umbilical cord, amniotic fluid) excreted from the body process is called childbirth. In some people’s minds, it seems that giving birth to children is a good sign and a sign of smooth delivery. In fact, this view is not correct. The delivery process is by no means a “quick war”, primipara all the labor process takes about 13-18 hours, the maternal also need 7-10 hours.