Mothers know the travail of giving birth to a child.
母亲们了解分娩时的痛苦。
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Sometimes the several-hours after delivery is called the " fourth stage" , because there are major physiologic changes like adaption to the blood loss, and the start of uterine involution, where the uterus begins returning to its pre-pregnant state.
有时分娩后几个小时称为“第四产程”,因为有很多重要的生理变化,例如血液流失的适应,以及
复旧的开
,
回到产前的状态。