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怀孕多少天生小孩
更新时间: 2020-11-05 00:00:00  

如果月经周期规律的话,怀孕的天数、孕周及预产期均是从末次月经第1天的日期算起的,与实际怀孕时间不相一致,实际怀孕时间是在末次月经后的排卵期,足月妊娠大于280天,也就是整个孕期是40周左右,在预产期的前两周和后两周内分娩均属于正常。预产期计算方法是末次月经月份加9或者减3,日期是日数加7,就可以得出预产期的月份和日期

关键词: 怀孕 多少 天生 小孩

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