High outdoor levels of nitrogen dioxide apparently raise the risk of sudden infant death syndrome (SIDS), according to California-based researchers.

美国加州大学的研究人员日前表示，户外高浓度的二氧化氮气会增加发生婴儿猝死综合症(SIDS)的危险。

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Babies who die of sudden infant death syndrome, or SIDS, while sharing beds may have a risky sleep profile, a new study shows.

一项新研究显示，共用床位可能导致婴儿睡姿不正确，增加婴儿猝死综合征的发生率。

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A baby whose mother smoked during pregnancy runs a higher risk of SIDS (sudden infant death syndrome - known in the UK as Cot death), as does an infant who is exposed to secondhand smoke.

母亲在妊娠期间吸烟的幼儿有较高的风险罹患SIDS(婴儿猝死综合症，英国称之为摇篮死亡)，暴露于二手烟的幼儿同样如此。

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"There should be nothing in the crib but the baby, " says Rachel Moon, who heads the AAP's task force on Sudden Infant Death Syndrome (SIDS), officially any death of a baby under age 1 that remains unexplained after a thorough investigation.

WSJ: When a Cuddly Crib Puts the Baby in Danger

The researchers studied the brains of 27 children, of which 19 died from Sudden Infant Death Syndrome (SIDS), and eight from other conditions.

BBC: Cot death remains a mystery