Nanit Sleeping Bags works with the Nanit Pro Camera (sold separately) to safely and comfortably detect your baby’s breathing motion–without any sensors, electronics, or radars! Real-time alerts sent to the Nanit Pro Camera and the app. Breathing motion detected in almost any sleeping position Made of soft, 100% cotton that’s machine-washable and dryer-safe. Two-way bottom zipper for quick late-night diaper changes. You get all three shown here. The two gray bags are size Medium (6-12 months), and the tan bag is size Small (3-6 months)