母亲性格决定第一胎胎儿性别权衡

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其中一条问题是 她们预计自己会活多久 。来自中下阶层和有工作背景的一些妇女认为自己只会活到40岁，而其他一些妇女相信自己将可以活到130岁。约翰斯博士认为，预计长寿的年龄与妇女第一胎的性别之间的联系可归结为是人类基因的一种 自私 的行为。

进化生物学家们把这种现象称为特里弗斯 威拉德假设。即当一位母亲生活在压力下，包括身体状况不佳、生活条件差和缺乏食物等，该母亲体内的生物感应会令她生下一个女孩而不是男孩。

然而近期的这个研究结果并不意味着妇女可以通过改变她们对未来的看法来改变第一胎的性别。

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