The main resons of negative reaction were noise, virus infection in early pregnancy, lower birth weight premature.

影响婴儿听力的主要高危因素为噪声、母孕早期病毒感染、早产低体重。

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This can lead to miscarriage, lower birth weight and is linked to learning difficulties, problem behaviour and asthma in childhood.

这会导致流产，低出生体重，并会导致孩子在幼年时的学习困难，问题行为和哮喘。

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The instance of premature birth and low-birth weight in infants was also lower in the massage group compared with the controls.

与一般孕妇相比，接受这类按摩的孕妇中出现婴儿早产和低出生体重的几率也更小。

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The findings indicated the relationship between birth weight and pollution was dose related - the higher the exposure, the lower the average birth weight.

BBC: Traffic fumes linked to lower birth weight