'tummy time' irrelevant, research finds
Putting infants to sleep on their backs, recommended since the 1990s, has helped reduce the rate of sudden infant death syndrome. But because of concerns that the practice might cause delays in motor development — as measured by the age at which babies roll over — parents were urged to give infants "tummy time" when awake to help build upper-body strength. Now a study, published in May in Early Human Development, suggests that tummy time may be irrelevant. Canadian researchers compared 1,114 infants born from 1990 to 1992, just before the "back to sleep" campaign began, with 351 infants born 20 years later. They found no difference between the two groups in the age at which prone to supine or supine to prone rolling began, or in the order in which the behaviors appeared.
Designated drivers sometimes imbibe
A new study suggests that many designated drivers do not refrain from drinking. Researchers interviewed and did breath tests on more than 1,000 people — including 165 who identified themselves as designated drivers — as they left bars in Gainesville after a Gators game. The tests were conducted six times over a three-month period. Only 65 percent of the designated drivers showed no blood-alcohol content, 17 percent registered 0.02 percent to 0.049 percent, and 18 percent measured 0.05 percent or higher. It is illegal in the United States to drive with a blood-alcohol content of 0.08 or higher. "When you look at evaluations of designated driver campaigns, they're really ineffective," said Adam E. Barry, an assistant professor of health education at the University of Florida. The study was published in the July issue of The Journal of Studies on Alcohol and Drugs.
New York Times