Swaddling calms colic and helps babies sleep better - and sleep plays a key role in your baby's cognitive and physical growth. KeaBabies Soothe Zippy Baby Swaddle Sleep Sacks provide warmth and snugness that mimics a cozy environment, offering a safe sense of calm for your baby. • Ergonomic designed swaddles for newborns & infants (0-6 months) • Durable baby sleep sacks • Baby swaddles with fully-lined bottom zipper for easy diaper changing • Baby sleep sacks made with breathable & temperature-regulating organic cotton (GOTS certified by CU 1042833) • Machine washable and dryer-friendly zipper swaddle sacks