The Safe to Sleep campaign might not be working.
Since 1994, the program has been urging parents and caregivers to put babies to bed on their backs.
But a new study in the journal Pediatrics found only about 44% of U.S. mothers report that they both intend to use this method and actually do so all the time.
About 77% of mothers said they usually, but not always, put their babies to sleep on their backs.
The Centers for Disease Control and Prevention said placing babies on their backs before they go to sleep reduces the risk of sudden infant death syndrome and suffocation.