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How many twins are born each year?

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Quick Answer

The birth rate of twins in the United States was one out of every 30 live births as of a study performed in 2009. This means the average number of twins being born each year is more than 130,000.

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Full Answer

Research suggests the dramatic increase in the number of twin births is due to the increased use of fertility drugs and assisted reproduction, which accounts for about two-thirds of the increase in twin births. The remaining third seems to be caused by the increase in the average age of a mother at birth, since older women are more likely to produce more than one egg each cycle.

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