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預產(chǎn)期提前就是生男孩？結論究竟有多準

出處：媽媽育兒網(wǎng) 日期：2015-02-10 11:28:57 編輯：Chen

 眼看著越來越接近預產(chǎn)期，孕媽此時的心情除了緊張還是緊張。在臨近預產(chǎn)期的那段時間里，每天有一點“風吹草動”就想著是不是要生了，每天都過著提心吊膽的日子，真是一個頭兩個大，汗?。。?/p>

早聽說預產(chǎn)期不是十分準確，有人提前也有人推遲。但竟然還有傳言說如果懷的是男寶寶，預產(chǎn)期則會提前，有誰能告訴我，這是真的嗎？

關于什么是預產(chǎn)期，預產(chǎn)期的計算方法以及與生男生女是否有關，接下來就由媽媽育兒網(wǎng)小編來一一為你詳細介紹吧！

首先，什么是預產(chǎn)期，預產(chǎn)期怎么計算？

預產(chǎn)期，即孕婦預計生產(chǎn)的日期。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）。

預產(chǎn)期本來也不那么“準”

預產(chǎn)期是根據(jù)人類平均妊娠時長“推算”出來的孕婦預計分娩日期。妊娠期全過程從末次月經(jīng)第一日開始計算，平均約40周。臨床上為了方便計算，通常采用末次月經(jīng)時間月份加9，日期加7來推算預產(chǎn)期。

對于記不清末次月經(jīng)及尚在哺乳期未恢復月經(jīng)就又懷孕的孕婦而言，臨床上也常采用早孕反應出現(xiàn)時間、胎動開始時間、子宮宮底高度、B超檢查等來幫助推算預產(chǎn)期。

正如平均身高并不能用來預測實際身高，預產(chǎn)期也不能被認定為實際分娩日期。而且，臨床常用的預產(chǎn)期推算方法，并不考慮不同月份在天數(shù)上的差異，本身就存在一定誤差。另外，孕婦記不清末次月經(jīng)日期或者月經(jīng)周期不準都可能讓推算的預產(chǎn)期不準確。再加上不同胎兒在宮內(nèi)發(fā)育存在一定個體差異，實際分娩日期同推算的預產(chǎn)期可能存在1-2周的時間差。

此外，一些孕婦妊娠相關疾病或多胎等胎兒相關因素也可能拉大實際生產(chǎn)日期與預產(chǎn)期間的時間差。

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