Brand new in box zen sack by nested bean. Size Small: - Age: 0-6 months - Weight: 7-18 lbs / 3-8 kgs - Height: 21-30 inches / 53-76 cms The gently weighted Zen Sack echoes your reassuring touch on baby’s chest, so your little one always feels comforted and secure, like in your embrace! - Helps transition from any swaddle - Can be worn backwards by tummy sleepers who can roll independently - Zen Sack Classic is perfect for year-round comfort