This transition swaddle allows baby to sleep in their natural arms up sleep position which gives baby the feeling of being swaddled in the womb and baby can safely move their hands to their mouth for true self soothing promoting better sleep. Carefully designed with safety as top priority the newborn swaddle sack keeps your baby comfortable and secure with a snug fit and no need for loose blankets. It offers 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 from premium cotton which is soft breathable and skin friendly it keeps your baby warm and cozy and is suitable for moderate climates. The arm and neck openings are sized for a perfect fit and roomy leg places promote hip healthy development. Designed with a smooth two way zipper it is convenient to take on and put off and makes midnight diaper changes super easy.