This was incredible! Only used one time because we needed the next size but it was an amazing night’s sleep for our little one. The Magic Sleepsuit aids in a baby's sleep patterns and gives parents peace of mind that their baby is getting adequate rest necessary for appropriate growth and development. The Magic Sleepsuit should be introduced at approximately three months of age when babies are transitioning from the swaddle or smaller sleep space. Proper fit and timing of introduction are critical to the safety and effectiveness of the Magic Sleepsuit. When the Magic Sleepsuit fits properly, the scooped neck will lay flat on the baby's chest, away from the face and the baby should not have the ability to pull their arms and/or legs inside the Sleepsuit. If the Sleepsuit is too big it will not provide the cozy, secure feeling necessary for success.