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孕13周的胎儿大小可以通过头臀长表示，即胎儿头顶到臀部之间的距离，通常在6.5cm。孕早期胎儿同步发育，此时的头臀长加上6.5等于B超预测的孕周，比孕妇按末次月经第一天推算的孕周更加准确。所以需要根据胎儿头臀长的数值，重新核对孕周。如果在

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孕13周的胎儿大小

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孕13周的胎儿大小、

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