另外，文章提到女宝宝的唐氏综合症的风险相对比男宝宝高，这我不太懂了，有谁听说过吗？求证。

之前有看到过jm们这样说到过，刚刚在一个海外论坛上找到了依据，有针对1325个单胎孕妇的研究数据表明，怀女宝宝的孕妇HCG水平显著高于怀男宝宝的孕妇，因此，怀男宝宝的孕妇验孕棒的中队长会来得晚一些。原文参考如下：

“Women who had a female fetus had hCG levels significantly higher than women who carried a male fetus. 

This finding is consistent with that found by several other researchers. In a study published by Yaron Y et al in Human Reproduction the authors studied 1,325 pregnant women with singleton pregnancies at 10-13 weeks.and compared different hormone levels including the pregnancy hormone hCG human chorionic gonadotropin between women carrying a male and a female fetus

These findings may have implications not only on evaluating risks of Down syndrome (women carrying female fetuses had a higher risk for Down syndrome), but also on timing of a pregnancy test. If women carrying a male fetus have lower hCG levels then it may be possible that their first positive urine pregnancy test could be delayed because of the male gender. ”

- See more at: http://www.babymed.com/pregnancy-news/hcg-levels-and-gender-fetus#sthash.wNt5lRC3.dpuf

所以说，没到姨妈日还没验出来的JM们也不要太早放弃哦！也许你的小王子已经在肚子里了呢！

另外，文章提到女宝宝的唐氏综合症的风险相对比男宝宝高，这我不太懂了，有谁听说过吗？求证。