Millions of infants around the world now sleep on their back and doctors have not found an increase in choking or other problems. Side sleeping Some babies at first may not like sleeping on their back, but most get used to it. If necessary, an infant can be placed on his side. The side sleep position does not provide as much protection against SIDS as back sleeping, but it is much better than placing the baby on his stomach. If you choose to use the side sleep position, make sure the baby's lower arm is forward to stop him from rolling over onto his stomach.
Bedding Make sure infants sleep on a firm mattress or other firm surface.
Don't use fluffy blankets or comforters under the baby. Don't let babies sleep on a waterbed, sheepskin, a pillow, or other soft materials. To prevent smothering, don't place soft stuffed toys or pillows in the crib with a very young infant. Temperature Babies should be kept warm, but shouldn't be allowed to get too warm. Keep the temperature in the room so that it feels comfortable to you.