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預產(chǎn)期計算器生男生女準嗎？

出處：媽媽育兒網(wǎng) 日期：2014-07-17 14:42:30 編輯：Chen

 在民間預測生男生女的方法有很多，從酸兒辣女到看孕婦肚子形狀，在到從孕婦的預產(chǎn)期，都是判斷生男生女的方法，這些預產(chǎn)期計算生男生女真的科學又靠譜嗎？

1、 什么是預產(chǎn)期

預產(chǎn)期，即孕婦預計生產(chǎn)的日期。本來，預產(chǎn)期不是精確的分娩日期，科學家們統(tǒng)計過只有53%左右的婦女在預產(chǎn)期那一天分娩。由于每一位孕婦都難以準確地判斷受孕的時間，所以，醫(yī)學上規(guī)定，以末次月經(jīng)的第一天起計算預產(chǎn)期，其整個孕期共為280天，10個妊娠月（每個妊娠月為28天）。

2、預產(chǎn)期判寶寶性別科學嗎

用預算期計算生男生女，其實就是把你的年齡【農(nóng)歷】加預產(chǎn)期的月份相加是單數(shù)就是男孩，反之是女孩。但實質(zhì)上，人的性別是由生殖細胞中的性染色體所決定的。與受孕時間無關。

具體來說，精子中的一半其染色體為（22+X），另一半為（22+Y）。卵子的染色體僅有一型即（22+X）。 染色體中的X和Y是決定性別的染色體，因此稱之為性染色體。

在精子與卵子結(jié)合的時候（卵受精時），若是具有（22+X）染色體的精子與卵子結(jié)合，二者則結(jié)合成為（44+XX），發(fā)育成為女胎。若是具有（22+Y）染色體的精子與卵子結(jié)合，二者則結(jié)合成為（44+XY），發(fā)育成為男胎。所以預產(chǎn)期計算生男生女并不科學

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