Choose the right size: The sleeping bag is available in two sizes: Medium for babies aged 3-6 months, up to 69 cm long/8 kg; Large for babies aged 6-12 months, up to 79 cm long/13.6 kg. Both sizes are designed with the baby's comfort and needs for growth and development in mind, for safe and comfortable care at every stage. Soft and stretchy: Made from bamboo fibers, rayon, and spandex, the sleeping bag is lightweight and breathable, and feels super soft. The safe and breathable fabric helps regulate the baby's body temperature and ensures the baby feels comfortable. The sleeping bag is highly elastic and durable, long-lasting and does not deform, even after frequent washing. Tog 0.5, suitable for room temperature 23-27°C, suitable for most seasons. Super easy to maintain: Machine washable, saves time. Great baby sleeping bag: Can be used as a safe, wearable blanket and replaces traditional swaddling to prevent the baby from coming loose or getting tangled in loose blankets. The highly elastic long-sleeved design allows babies to self-soothe by sucking their fingers without feeling restricted, and prevents them from scratching themselves in their sleep. Very suitable for newborns or babies who are starting to roll over. Promotes self-soothing and encourages independent sleep: The baby swaddle with a tighter waist can be wrapped snugly and adjusted well, providing a soft sense of security, effectively calming the baby and reducing the number of times the baby wakes up, allowing both parents and babies to sleep better. Improved high-quality SBS two-way zipper, smoother and not easily damaged, so you can use it with peace of mind. Easy to put on and take off, quick diaper changes and does not affect the baby's sweet sleep. Widened hem to promote baby's growth: The wide hem promotes the development of the baby's hip joints, and the legs can kick freely but are not kicked off.