✔️ REDUCE STARTLE REFLEX -- The transition swaddle 3-6 months allows baby to sleep in their natural arms up sleep position, which gives baby enclose feeling of being swaddled in the womb. Also, baby can safely move their hands to their mouth for true Self- Soothing, the arms up swaddle 3-6 months promotes better sleep. | ✔️ SAFE & ERGONOMIC DESIGN -- Carefully designed with safety as top priority, the newborn swaddle sack keep your baby comfortable and feel secure with it’s snug fit, no need for loose blankets. Arms-In to reduce startle reflex, One-Arm-Out for self-soothing, and Two-Arms-Out for easy transition from baby swaddle to baby sleep sack. | ✔️ MADE FOR COMFORT -- The newborn sleep sack 3-6 months is made from 100% premium cotton, which is soft, breathable and skin-friendly. TOG 0.8 keep your baby warm and cozy, suitable for moderate climates. The arm and neck openings sized for a perfect fit, roomy leg places promote hip healthy development. | ✔️ DURABLE DOUBLE ZIPPER -- Designed with smooth 2-way zipper, the infant sleep sack is convenient to take on/ put off, makes it super easy for midnight diaper change. The interior zipper guard and top zipper flap prevent irritation from baby's delicate skins. | ✔️ BABY SHOWER GIFT -- Wearable blanket baby sleep swaddle is essential baby items for new parents, the set of 2 is convenient for daily change while the neutral color fits both baby boys and girls, it is perfect as baby shower gift, baby registry and more. Please refer to the size chart to chose the right size for your beloved one.