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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Much of the size difference appears after birth.

脑袋的大小差异很大部分是在出生后出现的。

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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.

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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.

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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