From the Ollie website: Therapeutic Difference Enhances your little one’s neuro-development Neuro-natal® sleep is foundational in reaching developmental milestones Helps to create positive sleep cues Eases the transition from the womb to the outside world Swaddling & Development Benefits Stretch in fabric allows freedom of movement, while still keeping your little one snug and contained Reduces waking suddenly due to the startle reflex or spontaneous arousal Decreases irritability while promoting self-soothing Helps to maintain supine position Can be used with one or both arms out Smoke free, pet free home. Used once.