Breathing Wear works exclusively with the Nanit Plus nursery camera, to monitor your baby's breathing motion without putting sensors on your baby. The specific patterns on the fabric were custom-designed to be read by the HD Nanit camera, making it easy to check in on your little one, from your Nanit app.Contains one 12-24 month Nanit Breathing Wear Sleeping Bag.* 100% cotton sleeping bag to comfortably track your baby's breathing motion* No electronics or sensors in the product, on your baby, or in the crib* Replaces loose blankets, making the crib a safer place* Designed to be worn over pajamas* Secure, quiet-open hook and loop attachments for the perfect fit* Easy diaper changes - custom-designed elongated zipper makes nighttime visits a breeze* Easy glide, pinch-proof, two-way zippers* Hip healthy - extra cozy for hips and legs to move freely* Room for baby to grow* Purchase Nanit Breathing Wear with your Health Savings Account or Flex Spending Account* Machine washable and designed for year-round use * Size: 12-24 months (20-30 lbs / 9.1-13.6 kg / 29-35" H)