Product Description Material: Pure Cotton Color: Style A, Style B, Style C Size: S (up to 70 cm), M (70-85 cm), L (80-90 cm) Season: Summer Package Contents: 1 * Vest Sleeping Bag Soft and Breathable: Made from two layers of lightweight and ultra-soft cotton muslin, this sleeping bag is exceptionally breathable for optimal airflow, reducing the risk of overheating and ensuring a comfortable night's sleep for your baby. Two-Way Zipper: The two-way zipper allows you to easily change your baby's sleeping bag by opening it from the top. The reverse zipper design at the bottom makes diaper changes quick and easy in the middle of the night while preventing your baby from getting cold. Protective Cover: The protective zipper cover at the top prevents the zipper from scratching your baby's delicate skin. Sleeveless Design: The sleeveless design reduces the risk of overheating and allows your baby's arms to move freely. Spacious and Comfortable: Our sleeping bags are generously sized to fit over nightwear and have been carefully designed to allow your baby's legs to move freely for proper hip development. Small sleeping bags are suitable for infants aged 0-12 months, medium sleeping bags are suitable for infants aged 12-24 months, and large sleeping bags are suitable for infants aged 24-48 months.