Dr Obel found that the more stressed a mother had been, the less chance she had of having given birth to a boy.

Obel博士发现母亲所受的压力越大，所生孩子为男孩的概率越小。

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A number of studies have linked preterm birth to an increased risk of ADHD, although the reasons aren't clear, noted Obel, of Aarhus University in Denmark.

丹麦奥尔·胡斯大学的阿贝尔说，已经有许多研究将早产和多动症患病风险联系到一起，但是目前原因尚不明确。

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A number of studies have linked preterm birth to an increased risk of ADHD, although the reasons aren't clear, noted Obel, of Aarhus University in Denmark.

丹麦奥尔·胡斯大学的阿贝尔说，已经有许多研究将早产和多动症患病风险联系到一起，但是目前原因尚不明确。

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