Purpose: Designed to help babies sleep more comfortably on warm nights by encouraging air circulation around the baby's body, thus keeping their temperature cool and constant. Transitioning from Swaddle: Suitable for babies who have outgrown swaddling or can no longer be swaddled safely, especially when they start showing signs of rolling onto their tummy during sleep. Unrestricted Arm Movement: The Sleepy Hugs Original allows babies to move their arms freely while sleeping, providing security to calm their startle reflex. Features: Full-body length zip with top zipper cover and a long zip along the bottom for easy middle-of-the-night nappy changes. Hip-friendly wide sack design that can accommodate a hip dysplasia brace. Optional use of 'Extra Hug' Belly Band/Strap for additional security. Age Range: Designed for babies aged 3-6 months. This product seems to prioritize both comfort and safety for babies during their sleep, especially in warm weather conditions.