Maternal leisure time physical activity and infant birth size.

产妇闲暇时间体力活动与婴儿出生大小。

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They compared the risk of getting breast cancer with birth size, relying on birth records, parent recall, and self reports.

他们根据出生卡片，父母回忆和自己报告比较患乳腺癌的风险和出生尺寸的关系。

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Still, Dr. Bernstein said the study was strong not just because of its size but because it weighed factors other than malformations, such as birth weight, that also affect the health of the baby.

伯恩斯坦博士还说，这项研究之所以强大，不仅是因为它的规模，还因为它考虑到除畸形以外同样影响婴儿健康的因素，如出生体重。

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And not just in America: in Germany, where the long years of low birth rates will reduce the size of the pool over the coming decade, Kienbaum, the country's leading pay consultancy, recently set up a special unit to comb academe for youthful high-fliers.

ECONOMIST: Too much inequality is bad for you

The vaccine differs from birth control pills not only in the size of its benefit to recipients, but also because the vaccine benefits more than simply the person who receives it.

FORBES: The Pill, the Pox and the Limits of Religious Freedom

The researchers found that more traditional Amish have families of nine or 10 children, while comparatively progressive families are just over half that size, suggesting some are using birth control.

WSJ: New research shows diversity among US Amish groups