In the United States, for instance, the number of twin births soared by 42 per cent between 1980 and 1997, while reports of triplets and more was five times higher.

在美国，比如，双胞胎诞生的数量在1980和1997年间增长了42%，同时三胞胎和三胞胎以上的怀孕报道数量增加了5倍。

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In this more benign environment, development proceeded normally, and the woman became pregnant with triplets who carried a mix of her DNA and her husband's — pretty much like any normal baby.

在这种更为有利的环境中，细胞发育正常进行。这位妇女怀上了三胞胎，胎儿携带着她和她丈夫两人的DNA——这跟其他正常的婴儿没什么大的差别。

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Information resources for parents of twins, triplets, and more.

信息资源家长双胞胎，三胞胎，更多。

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"As a first-time parent, it was so helpful to have role models, moms who had been through it before me, " says Pamela Fierro, the author of "Mommy Rescue Guide: Twins, Triplets, and More" and the mother of twin teenage girls.

CNN: Moms with twins battle time on multiple fronts

In 2011, 11, 330 women gave birth to twins, 172 to triplets and 3 had quads or more.

BBC: Babies boom by a fifth in a decade - ONS

Twins tend to be born smaller and earlier - triplets even more so.

BBC: IVF should be given sooner and to older women, says NICE