Some babies can be unusually sensitive to touch, light, or sound, and might startle and cry easily, sleep less than expected, or turn their faces away when someone speaks or sings to them. If that’s the case with your baby, keep noise and light levels low to moderate. Proper swaddling keeps a baby’s arms close to the body while allowing for some movement of the legs. Not only does swaddling keep a baby warm, but it seems to give most newborns a sense of security and comfort.