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21周的胎儿体重增加多少正常
更新时间: 2020-11-05 00:00:00  

21周的胎儿体重300~350克,身长约16~18厘米,这个时候的胎儿体重开始大幅度的增加。这时的胎儿看上去变得很滑溜,身体上覆盖了一层白色的、滑腻的物质,这就是常说的胎脂了。胎脂可以保护胎儿的皮肤,以免在羊水的长期浸泡下受到损害。

关键词: 胎儿 体重 增加 多少 正常

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