The SwaddleDesigns Omni Swaddle Sack is designed for newborns and offers a versatile swaddling solution with adjustable wrap and arms up sleeves with mitten cuffs. It is ideal for snug swaddling, allowing various arm positions as the baby grows. The ergonomic design supports natural hand and arm positions, promoting safe sleep. Made from 100% cotton, the sack is breathable, stretchy, and soft. It features a 2-way zipper for easy diaper changes and is machine washable. Suitable for babies weighing 6-14 lbs and aged 0-3 months.