他们大部分都很健康，但作为一个整体他们由于低的出生体重而有更高的健康风险，因为低出生体重和肥胖、高血压和II型糖尿病密切相关。

Most of them are healthy. But as a group they're at a higher risk for low birth weight, which is associated with obesity, hypertension and type 2 diabetes later in life.

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怀孕期间受二手烟影响会增加低出生体重的几率。

Exposure to secondhand smoke during pregnancy increases the risk of low birth weight.

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早产和由此带来的低出生体重，会带来长期的负面后果。

Premature birth, and the low birth weight that's associated with it, has been linked to long-term negative consequences.

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