Double Stuff

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WASHINGTON, D.C.: Finally, an explanation for all those double-seated strollers. A new government study shows that twin births have increased 42 percent since 19980. The main reason? Fertility drugs. Twin rates were highest in Connecticut and Massachusetts, with a rate of 27.7 twin births per 1,000 births between 1992 and 1994, in large part because mothers there tend to give birth later in life, when twins are statistically more likely, and use fertility treatments.