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nt头臀长多少可以做

更新时间: 2020-11-04 00:00:00     

顶臀长可以用在孕早期估算胎龄,孕7周到孕12周之间测量最准确。因为孕7周之前,由于胎儿太小,12周之后,胎儿的上半身呈现弯曲形状,都无法准确测量。在无法测量的孕周,准妈妈可以依据下面的公式推算胎儿的顶臀长:顶臀长=孕周-6.5,单位是厘米。需要注意的是,胎儿顶臀长不等于身长。

关键词: nt 多少 可以

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