Pediatric research compares swaddling to recreating the familiar and comfortable environment of the womb. As some babies take longer to adjust to their new world, swaddling might provide the comfort they require to make an easier transition.
 
Studies suggest and many parents agree that swaddling helps babies sleep better. Being snuggly tucked in prevents startling limb movements that cause them to awaken frequently. Providing the familiar snug and warm environment for the first few months might help reduce fussiness.