Normal healthy babies should always sleep on their backs unless otherwise advised by a pediatrician.
Only a fitted sheet, mattress pad/and or waterproof pad should be used under your baby.
When baby is put to sleep, remove pillows, quilts, comforters, sheepskins, pillow-like stuffed toys and other pillow-like products from the crib.
Cover baby with a thin covering such as a crib blanket, receiving blanket or other covering specifically designed for baby sleep time. Do not overdress your baby. Consider swaddling for newborns and sleepers, sleep sacks or other sleep clothing alternatives.
Use bumper pads only until child can pull himself or herself up to a standing position. Then remove pads to prevent child from climbing out of crib.