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胚胎多少天开始发育
更新时间: 2020-11-05 00:00:00  

从受精卵开始着床的那天开始。怀孕第一个月还不能称之为胎儿,因为现在还是一个胚芽。怀孕两个月之后,再做B超,就会发现胎儿已经有了人的模型,三个月的时候胎儿的手指脚趾就比较明显了。

关键词: 胚胎 多少 开始 发育

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