母親性格決定第一胎胎兒性別權衡

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其中一條問題是 她們預計自己會活多久 。來自中下階層和有工作背景的一些婦女認為自己只會活到40歲，而其他一些婦女相信自己將可以活到130歲。約翰斯博士認為，預計長壽的年齡與婦女第一胎的性別之間的聯系可歸結為是人類基因的一種 自私 的行為。

進化生物學家們把這種現象稱為特里弗斯 威拉德假設。即當一位母親生活在壓力下，包括身體狀況不佳、生活條件差和缺乏食物等，該母親體內的生物感應會令她生下一個女孩而不是男孩。

然而近期的這個研究結果并不意味著婦女可以通過改變她們對未來的看法來改變第一胎的性別。

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