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JAMA. 2009;301(21):2205-2206.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

MMWR. 2009;58:49-52

2 tables omitted

Low birthweight (LBW) (<2,500 g) is an important cause of infant morbidity and mortality.¹ The rate of LBW has been steadily increasing in the United States. In 2005, the most recent year for which data are available, LBW represented 8.2% of all births, the highest level reported in the past 4 decades.² The use of assisted reproductive technology (ART)* has been associated with LBW.^3-4 Research in 1999 indicated that, in Massachusetts during 1989-1996, the rate of LBW increased, paralleling the national trend, and an increasing percentage of LBW infants were born to mothers aged 35 years and to mothers with more education. These findings suggested that a proportion of LBW births might be attributable to infertility treatment; however, at that time, no information was available from birth certificate records to examine whether ART was associated with the increasing rates of LBW. To investigate the role . . . [Full Text of this Article]

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