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多少周胎儿的头朝下
更新时间: 2020-11-05 00:00:00  

34周以后大部分的胎儿都是头朝下的,34周之前由于胎位没有固定,所以无法进行判断。

胎儿,是指妊娠8周以后的胎体。妊娠4~8周娩出的胎体为胚胎。胚胎期重要器官逐渐形成,在胎儿期各器官进一步发育成熟。胎儿在妊娠28周以前娩出的现象称为流产;孕28~37周前娩出的现象称为早产,孕37周至不满42足周娩出的现象称为足月产。妊娠全程共280天即40周。

关键词: 多少 胎儿

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