Babies sleep safest on their backs.
The practice of placing babies on their backs to sleep has decreased the rate of SIDS by more than 50 percent.
Sudden infant death syndrome (SIDS) is the sudden, unexplained death of an infant younger than one year old. Some people call SIDS “crib death” because many babies who die of SIDS are found in their cribs.
Another risk factor for SIDS is smoking.
Exposure of babies to tobacco smoke in the home before or after birth increases the risk of death. The greater the exposure the higher the risk.