Always place your baby on his or her back to sleep, not on the stomach or side. You'll want your baby to fall asleep on his or her own. This may mean doing your nighttime routine and putting the baby into the crib while he or she is drowsy but still awake. If the baby cries, stay away for a few minutes. Your baby may settle down and go to sleep.
If the crying continues, soothe your baby for a moment without picking him or her up. This may go on a few times until your baby figures out that the crying is not getting results. This can be tough for parents, since it's upsetting to hear your baby cry. If you know your baby is safe (and not hungry, wet, soiled, or feeling unwell), it's OK to give him or her time to settle down. Use a firm sleep surface. Cover the mattress with a sheet that fits snugly.