The crown-rump length becomes less accurate after 12 weeks in determining gestational age because the fetus begins to curve.
孕12周后，因胎儿身体屈曲，以胎儿顶臀径推算孕龄已不够准确。
Normal thickness depends on the crown-rump length (CRL) of the fetus.
正常厚度取决于冠臀长(CRL)的胎儿。
Normal thickness depends on the crown-rump length (CRL) of the fetus.
正常厚度取决于冠臀长(CRL)的胎儿。
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