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孕20周正常是多少天

更新时间: 2020-11-04 00:00:00     

20周=140天

怀孕时间从末次月经第一天开始计算,七天是一周,四周为一个月,预产期是第280天,共四十周,十个月。也就是说,不能按照一个月有30天或者31天来计算孕几月,应该以4周为一个月,也就是28天一个月来计算。所以怀孕20周就是5个月。

关键词: 正常 多少

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