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18周胎儿的头围标准是多少
更新时间: 2020-11-05 00:00:00  

18周胎儿的头围标准大约是149mm,胎儿头围是指绕胎头一周的最大长度。胎儿的头部从前面到后面最长的部分,通常情况下是从前额的鼻根”到后脑的枕骨隆突”的距离最长,所以一般头围就是从前额的鼻根”到后脑的枕骨隆突”绕一周的长度。

关键词: 胎儿 标准 多少

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