The advantage of swaddling is that it simulates the womb environment and enhances the sense of security. The principle is that the baby is wrapped in amniotic fluid in the womb, and the tight wrapping feeling of the swaddling can restore this "feeling of restraint" and reduce the startle reflex (Moro reflex) caused by external stimuli, because it makes it easier for babies to fall asleep and sleep more stably. Many studies have shown that babies who use swaddling can reduce the number of night wake-ups by 30%~50%, especially for newborns aged 0~3 months. It can also reduce the startle reaction and improve sleep quality. After improving sleep and enhancing the sense of security, the frequency of baby crying is reduced. Now swaddling mostly adopts Velcro or zipper design, which can be completed within 30 seconds, making it easier to care for, reducing the pressure of parenting, and parents can also get more adequate rest time.