Besides back sleeping, what else can I do to help lower the risk of Sudden Infant Death Syndrome (SIDS) ?

If you are co-sleeping with you baby, make sure that the surface of the bed is firm and solid, with no covers. Do not put the blanket/comforter over your baby as that might hinder his breathing. Also, if you are a heavy sleeper, do not sleep with your child as you might accidentally roll on top of her.