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编辑同志:我生产时距离预产期还有12天,打听后发现,身边大多数人生产时亦都或早或迟,预产期都不太准。这是为什么呢?山东夏××夏读者:对预产期的推算,方法有多种,例如,末次月经法,即按末次月经时间的第一日算起,月份加9,日数加7。像最后一次月经是2月5日,预产期就是11月12
Editorial comrades: I have a production period of 12 days from the expected date of birth, found that most people around when they are also produced sooner or later, the expected date of birth are not accurate. For example, the last menstrual method, that is, according to the first day of the last menstrual period, the month plus 9, the number of days plus 7. The reason is this? Shandong Xia XX summer reader: There are many ways to estimate the expected date of birth. Like the last menstruation is February 5, the expected date of birth is November 12