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原來，龍鳳胎是這樣形成的

出處：媽媽育兒網(wǎng) 日期：2014-10-27 11:16:59 編輯：Chen

雖然單獨(dú)二胎新政策已陸續(xù)在各省放開，不過對(duì)于想生兩娃的夫妻來說，都要做兩次“功課”。

十月懷胎不容易，分娩的痛苦也不輕。如能一次完成兩次“任務(wù)”，且能生個(gè)一男一女，那豈不是完美人生？

雖然這個(gè)愿望有點(diǎn)遙不可及（必竟生龍鳳胎的幾率太小了)，但只要掌握了龍鳳胎形成的方法，一切就皆有可能了。

龍鳳胎的形成

龍鳳胎，指的是性別不同的雙胞胎，屬于異卵雙胎的一種，異卵雙胎的胎兒，性別、血型可以相同也可以不同，所以才可能同時(shí)生出一男一女。

異卵雙胎的過程大致是，兩個(gè)卵子分別和不同的精子受精后形成兩個(gè)受精卵，并分別發(fā)育成胚胎，這種雙胞胎是兩個(gè)胎兒各有單獨(dú)的胎盤、絨毛膜和羊毛膜，兩個(gè)胎盤之間的血液循環(huán)并不相通，兩個(gè)胎兒安居在各自的胎囊里。

所以性別有可能不一樣，異卵雙胎最后生下的雙胞胎有兩三種情況，即兩個(gè)全是男孩，兩個(gè)全是女孩，一男一女，而一男一女這種情況就是所謂的龍鳳胎了。本文源于_小精靈兒童資訊站

雙卵雙胎

遺傳信息：遺傳信息略有不同

外貌特征：性別相同、血型、體質(zhì)不一定相同

這個(gè)月，媽媽的卵巢排出了2個(gè)卵子，也就是我和我的姐妹，為了區(qū)別，我們的名字就叫“1號(hào)”和“2號(hào)”吧。我們同樣等待著精子先生的到來。

結(jié)局一：兩個(gè)女孩

“1號(hào)”和“2號(hào)”遇上了兩個(gè)帶有X染色體的精子，于是，我們分別結(jié)合成了兩個(gè)受精卵，分別發(fā)育成兩個(gè)胎兒，我們出生后，將會(huì)是一對(duì)好姐妹。

結(jié)局二：兩個(gè)男孩

“1號(hào)”和“2號(hào)”遇上了兩個(gè)帶有Y染色體的精子，那么我們以后將會(huì)是一對(duì)好兄弟。

結(jié)局三：龍鳳胎

“1號(hào)”和“2號(hào)”遇上的兩位精子先生，一個(gè)帶有Y染色體的精子，一個(gè)帶有X染色體的精子，那么，和帶有X染色體精子結(jié)合以后的受精卵就是女孩，而和帶有Y染色體精子結(jié)合以后的受精卵就是男孩。據(jù)說，這樣的幾率有50%呢！

小編提示：一次懷兩孩已經(jīng)很不容易了，兩孩還要一男一女那就更是難上加難了。雖然如今很多偏方說能提高懷龍鳳胎的幾率，但必竟不是百分百可信。而且很多促排卵的藥物均有導(dǎo)致頭暈、惡心、肝腎功能損害等副作用。所以，一胎生幾個(gè)，生男孩還是生女孩，最好還是順其自然吧。

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

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