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懷男孩能吃還是女孩能吃？這有科學依據(jù)嗎？

出處：媽媽育兒網(wǎng) 日期：2020-10-15 14:25:17 編輯：Limbo
有些孕婦懷孕后會變得很能吃，那么懷男孩能吃還是女孩能吃？這有科學依據(jù)嗎？下面的內(nèi)容一起來看看吧！

懷男孩能吃還是女孩能吃？

1、懷孕后能吃和懷男孩女孩沒有關系，由于懷孕后身體激素的影響，有的婦女會出現(xiàn)厭食、惡心嘔吐的癥狀，有的婦女會出現(xiàn)饑餓感，總是想吃東西的感覺，都屬于早孕反應的表現(xiàn)，各不相同而已。懷孕后期能吃，是因為胎兒入盆，胃空出來會有食量增大，一般在懷孕中期食量會減小。
2、男孩女孩都一樣，只要健康就好，何必在意呢！胎兒性別是在卵子和精子結合的一瞬間就已經(jīng)決定了，孕婦能不能吃是根據(jù)孕婦的自身情況決定的，有的能吃卻不一定會長在胎兒身上，因此合理飲食最重要。通過孕婦的食欲辨別胎兒性別是錯誤的，完全沒有科學依據(jù)的。
3、關于性別問題可以在懷孕三個月后做b超檢查，鑒定性別，但法律規(guī)定，不可以做性別鑒定，醫(yī)生一般不會講的，只要胎兒發(fā)育正常就放心。

生男生女由誰決定有科學依據(jù)嗎

1、現(xiàn)代醫(yī)學已經(jīng)證實生男生女在不考慮其他外界因素的影響下生男生女主要由男方的性染色體決定。
2、人類的生殖細胞中，有23對即46條染色體，其中22對為常染色體，1對為性染色體，女性的性染色體為XX，基因型可用46，XX表示；男性的性染色為XY，基因型為46，XY。生殖細胞要經(jīng)過兩次減數(shù)分裂，23對染色體變成23條，卵子所含性染色體只有X一種，而精子可分別含X或Y性染色體。當精子與卵子結合后，受精卵的染色體又恢復成23對。
3、若含X染色體的精子與卵子結合，受精卵為XX型，發(fā)育為女胎；若含Y染色體的精子與卵子結合，受精卵為XY型，發(fā)育成男胎。
4、所以，生男生女取決于參加受精的究竟是X精子，還是Y精子。而精子與卵子的結合是隨機的，是不以人們的意志為轉移的，這樣才能維持人類兩性比例的大體平衡，這也是一種自然界的生態(tài)平衡，這個平衡決不容破壞，否則，必然造成不堪設想的社會問題。

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