美国耶鲁大学的研究者发现在情人节那天自然分娩的孕妇在慢慢地增多——平均高3.6%。

Researchers at Yale University in the US found an increase in spontaneous deliveries on Valentine's Day - at 3.6 per cent higher than average.

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他们还发现在万圣节那天分娩的孕妇出奇的少——比平时少了5.3%。

They also found an unusually low number on Halloween - at 5.3 per cent lower than normal.

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