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二胎看男女 從尿液顏色知二寶性別靠譜嗎？(2)

出處：媽媽育兒網(wǎng) 日期：2014-04-02 12:22:54 編輯：Chen

二、看孕囊形狀就知道是男女？

現(xiàn)在各大母嬰論壇流傳的是從孕期常規(guī)檢查結(jié)果中看端倪，孕期常規(guī)檢查真能辨別男女嗎？有人說，看孕囊，長條形的話二寶就是男孩，橢圓形或者圓形為女孩。

科學破解：孕囊即妊娠囊，是受精卵在子宮內(nèi)膜著床后，子宮蛻膜完全覆蓋受精卵所形成的囊性結(jié)構(gòu)，也就是胚胎的最初形式。懷孕5周左右，通過B超可以看到比較清晰的孕囊形態(tài)，算是確定早期妊娠最準確的標志。

孕囊的實際形態(tài)和胎兒的性別沒有關(guān)系，基本上都是一個三維的球體或橢圓體，而我們B超下所見的孕囊只不過是三維結(jié)構(gòu)的一個切面。稍懂點幾何知識的人都應該知道，所選的切面不同，其形狀就會不同，于是會出現(xiàn)這樣的情形，兩個形態(tài)類似的孕囊，因為受精卵著床的位置不同，在B超上顯示的形狀完全不同。

統(tǒng)計資料顯示，B超下常見的孕囊形態(tài)多為圓形或橢圓形，偶爾會出現(xiàn)近似長條形，但是實際上男女比例是接近1:1的。通過孕囊形狀來判斷男女的這一說法毫無科學根據(jù)，只是準媽媽們茶余飯后的八卦而已，不可當真。

三、腿毛長得比之前快，就會生男孩？

有人說，如果你懷二寶之后，發(fā)現(xiàn)腿上的汗毛嗖嗖嗖長得額外快，那么就很可能懷了男孩。還有人說，懷孕后汗毛變黑變長，八成就是懷了男孩。因為雄性激素增多，會導致毛發(fā)生長，既然長這么快，那就可能是雄性激素過多，從而推出你肚子里懷的二寶是男孩的結(jié)論。

科學破解：懷有二寶，激素水平升高導致毛發(fā)生長旺盛

其實，根據(jù)長毛情況來推斷生男生女也并不合理。懷孕以后，人體內(nèi)的激素水平會有變化，體毛變化也是常見的。因為懷孕后雌激素分泌增多，毛發(fā)的生長率一般都會提高20%，毛發(fā)自然也容易變得更加濃密；同時，雌激素的分泌又刺激了雄性激素的分泌，促進體毛的生長。

可能很多孕媽就要擔心了，長此以往，還不會變成長毛怪？不用擔心，既然是激素引起的，那就沒關(guān)系，懷孕過程完畢，等你生下寶寶以后，激素就回到孕前的水平，毛發(fā)也就不會瘋長啦。

所以，二胎寶寶是男是女，跟你的腿毛神馬的，一點關(guān)系都沒有！

本文由媽媽育兒網(wǎng)（http://m.15thirdstreetblackrock.com/）小編編輯整理

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