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怀孕多少周是成型了
更新时间: 2020-11-05 00:00:00  

孕周从末次月经第一天开始计算,通常比排卵或受精时间提前两周,比着床时间提前三周,妊娠10周内(受精后8周)的人胚称为胚胎,是器官分化、形成时期。自妊娠11周(受精第9周)起称为胎儿,是生长、成熟的时期。妊娠8周末,胚胎初具人形,头大,占整个胎体近一半,能分辨出眼、耳、鼻、口、手指及足趾,各器官正在分化发育,心脏已形成。

关键词: 怀孕 多少 成型

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