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46天胎心正常多少
更新时间: 2020-11-05 00:00:00  

46天的胎心还并无正常规律可言,时快时慢,有时候甚至会突然停下,多在120-160次/分的范围,时而也会超出这个范围,但这都属于正常表现。在母体受孕后的16天,孩子的心脏就开始跳动,到了孕一月左右开始有了心脏的模样,但是还太过弱小,因此难以追踪到。而医生之所以推荐准妈妈在孕12周开始建档,做B超,是因为这个时期就能够通过超声波听诊器来检测胎心了。

关键词: 正常 多少

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