If the air in the room is flowing better, babies might be at a lower risk of sudden infant death syndrome.
Researchers say using a fan to circulate air seems to lower the risk.
The research involved nearly 500 babies. An author of the study says the research suggests that the "sleeping environment really matters." He says better ventilation seems to mean reduced risk.
Experts say the best way to prevent SIDS is still to place babies on their backs to sleep. They also recommend a firm mattress, and that you remove toys and pillows from cribs, and keep infants from getting too warm.
Americans have been following that advice, cutting the number of SIDS deaths in the U.S. by more than half over the course of a decade. But still, it's the leading cause of death in infants between one month and one year old.