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从精子和卵子结合成为受精卵,到发育为成熟的胎儿而降生,这就是妊娠期限——这一段生命过程是在母亲内度过的.人的妊娠期限为280天。所以,“出生便是一岁”的说法大抵是正确的。妊娠期的计算是从末月经的第一天算起的,但是,我们知道女子排卵是在月经以后两星期左右,因此,真正受孕或孕期要比上述时间晚两星期。按照1926年那氏的计算,妊娠期限应为273.8天。
From sperm and egg into fertilized eggs, to develop into a mature fetus and birth, this is the period of pregnancy - this period of life is spent in the mother, the human pregnancy period is 280 days. So, the phrase “born one year old” is probably correct. Pregnancy is calculated from the first day after menstruation, but we know that women ovulate about two weeks after menstruation, so the actual pregnancy or pregnancy than the above two weeks later. According to 1926’s calculation, the pregnancy period should be 273.8 days.