100% cotton, skin-friendly and soft, breathable and comfortable, smooth to the touch. Healthy, 0 fluorescent agents—safe for babies to chew. Detachable wings serve as a separate wrap or belly band, providing warmth and security for the tummy while sleeping. Baby sleeping bag: remove the wings to transform into a vest-style sleeping bag. Velcro design allows for adjustable tightness based on body shape. Wide hem for ample space, allowing natural turning without restriction. Two-way zipper design for easy diaper changes. Every design detail contributes to better sleep (Velcro design, detachable wings, zipper flap, snap buttons at the hem). Hugging-style wrap, providing comfort like a mother's embrace. Innovative bionic wrapping technology simulates a mother's hug, ensuring a sense of safety. Phased design to meet different growth needs more scientifically. 360° close-fitting wrap, light and breathable. Moisture-wicking for comfort at all times.