Safety and Comfort: Made of 100% premium cotton, soft and breathable, to guarantee the utmost comfort and the protection of infant's sensitive skin. Yoofoss newborn swaddle sack is certified to meet Consumer Product Safety Commission (CPSC), dedicating to ensure your baby's safety and coziness. | Ergonomic Design for Healthy Development: As a hip-healthy baby swaddle by cradling newborn in a natural and comfortable position, the startle reflex will be prevented. Yoofoss Baby swaddle sack provides ergonomic hip support for an infant's first 6 months of growth, allowing the infants to stay calm and sleep more peacefully. | Adjustable for Snug Fit: This newborn swaddle sack with the hook and loop allows you to adjust tightness, wraps around baby for a perfect fit in every sleep stage, from newborn with the arms in to sleeping with both arms out. Our newborn swaddle creates a womb-like feeling and helps soothe and calm the baby. | Easy to Use: With just three simple steps, swaddle blanket for newborn makes parenting becomes easier and novice dads can effortlessly and confidently dress their babies. Moreover, our infant swaddle suitable for all seasons, nurture infants through a quality and sweet sleep experience. | Sizing and Mahchine Washable: 2 sizes available swaddle sleep sacks for your choices; S for 0-3 Months, M for 0-6 Months. Please measure your newborn's height and weight, and refer to the size chart before choosing. Swaddles for newborns withstand multiple machine washes, shrinking and reduce the household chores for parents.