More US women having twins; rate at 1 in 30 babies
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| Graphic charts number of twin births per thousand births since 1985. |
The number of twins born in the U.S. soared over the last three decades, mostly the result of test-tube babies and women waiting to have children until their 30s, when the chances of twins increase. read more..
source:http://yhoo.it/wZL9WO
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