SIDS (Sudden Infant Death Syndrome) is when a baby dies suddenly and unexpectedly while sleeping. It happens to some babies, but doctors still don't know why it happens. A baby could be perfectly healthy, and then just stop breathing and die. It's very, very rare, but still something that parents and doctors want to prevent.
To help prevent SIDS, parents should follow the "ABCs" of safe sleep:
A - Alone. Babies should always sleep alone, with nothing else in the crib, like toys or blankets or pillows.
B - Back. Babies should always sleep on their back, on a firm mattress.
C - Crib. Babies should always sleep in a safe crib or bassinet, with no other objects around like bumpers or stuffed animals.
By following these rules and taking other precautions like not smoking around the baby or overheating the baby, parents can help reduce the risk of SIDS.