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Multiple Births - Carrying to term

Since 1980, the incidence of multiple births has been increasing in the US. Two factors contributing to this increase are 1) a greater number of women over the age of 30 becoming pregnant (women over 30 are more likely to have multiples) and 2) an increase in the use of fertility-stimulating drugs and assisted reproductive techniques. Women carrying more than one baby are at increased risk of pregnancy complications.

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National Toxicology Program (NTP), within the U.S. Department of Health and Human Services, is an interagency program headquartered at the National Institutes of Health's National Institute of Environmental Health Sciences (NIEHS) located in Research Triangle Park, NC.
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