There's nothing sadder than hearing a child has died of SIDS. While no one knows exactly what causes it, there are a few steps you and your family can take to reduce the risk:
1. Let's babies sleep on their backs.
2. Use a firm sleeping surface.
3. Keep soft things (blankets, stuffed animals, pillows) out of the crib.
4. Ovoid overheating.
You can find more helpful information here.