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怎樣生龍鳳胎 生龍鳳胎不外傳的秘方(2)

出處：媽媽育兒網(wǎng) 日期：2010-08-13 12:55:34 編輯：admin

方法三：試管嬰兒，想要幾個生幾個?

“試管嬰兒”是通過促排卵技術促進女性卵巢內的卵泡發(fā)育，然后從中取出卵子進行體外人工受精，再將發(fā)育的胚胎移植到子宮里孕育。因為這一過程是在醫(yī)生的人工操縱下進行的，為了保證受精卵的質量，一般會多選幾個卵受精，在它們發(fā)育到一定程度時，選擇最好的2～4個植入母體子宮腔內，最后保留一個最好的胚胎，讓其在子宮內著床發(fā)育，直至胎兒誕生。

但有些女性的身體條件允許兩個胚胎同時發(fā)育，加之自己又有要求，醫(yī)生也可為其保留兩個胚胎，于是就產生了雙胞胎。不過，衛(wèi)生部對應植入多少枚受精卵有明確規(guī)定：35歲以上的可植3個，35歲以下的最多只能植兩個，盡量減少雙胞胎或多胞胎出生率

方法四：服用葉酸，能增加懷龍鳳胎的幾率?

瑞典一醫(yī)學研究機構最近指出，服用葉酸的女性懷雙胞胎的機會比沒有服用的女性高出近一倍。據(jù)報道，瑞典的研究人員自1994年開始研究分析當?shù)卦袐D曾服用藥物的資料和數(shù)據(jù)，他們發(fā)現(xiàn)在2569名曾服用葉酸的孕婦中，她們所生的孩子每100名中就有2.8人為雙胞胎嬰兒，而在沒有服用葉酸的孕婦中，這一比例為1.5。

研究人員指出，服用葉酸導致生雙胞胎機會增大的原因還不太清楚。據(jù)專家估計，葉酸補充劑可能會增加排卵的次數(shù)，使多個卵子進入子宮，因而產生雙胞胎。這一結論是否正確，還有待于進一步研究證實。

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