3 ways to comfortably transition your baby from a swaddle and muffle the startle reflex for better sleep! Wear as a Sleepsuit, wearable blanket by zipping the legs together or sleep Vest by detaching the arms | Provides your baby with a cozy, secure feeling without loose blankets: cloud-like polyester fill provides warmth and fits your baby snugly like they are being hugged when sleeping on their back | More breathable: vented mesh panels on legs & sides keep baby cool and comfortable | Fits comfortably & allows easy diaper changes: features a scoop neck, covered zipper, open arms & legs, roll-up cuffs and large zipper opening for diaper changes | Machine Washable; 100% Cotton; size: 3-6 months (12-18 lbs)