MMWR: Morbidity and Mortality Weekly Report: Surveillance Summaries, February 10, 2017 [open pdf - 533KB]
"Since the first U.S. infant conceived with assisted reproductive technology (ART) was born in 1981, both the use of ART and the number of fertility clinics providing ART services have increased steadily in the United States. ART includes fertility treatments in which eggs or embryos are handled in the laboratory (i.e., in vitro fertilization [IVF] and related procedures). Women who undergo ART procedures are more likely than women who conceive naturally to deliver multiple-birth infants. Multiple births pose substantial risks to both mothers and infants, including obstetric complications, preterm delivery, and low birthweight infants. This report provides state-specific information for the United States (including the District of Columbia and Puerto Rico) on ART procedures performed in 2014 and compares birth outcomes that occurred in 2014 (resulting from ART procedures performed in 2013 and 2014) with outcomes for all infants born in the United States in 2014."
Morbidity and Mortality Weekly Report: http://www.cdc.gov/mmwr/index.html/
MMWR: Morbidity and Mortality Weekly Report (February 10, 2017), v.66 no.06