The increase was most notable among African-American infants, according to the study reported Monday in the journal JAMA Pediatrics.
Overall, the percentage of nighttime caregivers who reported that an infant usually shared a bed rose from 7% in 1993 to 14% in 2010. Among black infants the proportion increased from 21% to 39%. Among white infants, it rose from 5% to 9%. Among Hispanic infants, it rose from 13% to 21%.
"The disparity in nighttime habits has increased in recent years," said lead author Eve Colson of the Yale University School of Medicine in a statement. "Because African-American infants are already at increased risk for SIDS, this trend is a cause for concern."
Advice from physicians could significantly reduce infant bed-sharing, also known as co-sleeping, for all families, finds the survey of nearly 20,000 caregivers conducted by researchers with the National Institutes of Health and others. Caregivers who perceived physicians' attitude as against sharing a bed were about 34% less likely to report that the infant usually shared a bed than were caregivers who received no advice.
To reduce the risk of SIDS and other sleep-related dangers, the American Academy of Pediatrics recommends placing babies to sleep in the same room as the caregiver, but not in the same bed.
Image: Bed-sharing family, via Shutterstock