Swaddling is the ancient practice of snugly wrapping in thin blanket for warmth and security, as a means of calming and soothing the baby to achieve healthy sleep. It creates similar feeling of the womb for a baby. It helps baby calm down and sleep for longer periods.
First few months after the baby is born, life turns upside down and you seem to loose count of day and night. If swaddling done right way, it can be real life saver for new overwhelmed, sleep deprived mom.