Our flagship mattress teaches children to become better sleepers over time. Lullabee uses gentle vibration and sound only when your child awakens, then tapers automatically when your child is ready to become an independent sleeper. Designed by a pediatric sleep neurologist, engineered by medical device experts, and manufactured in the USA. Additional details: Safe to use from birth through toddler years. Fits standard cribs. Mattress dimensions are 52”L x 27.5”W x 5”T Completely wireless and powered by a rechargeable battery that typically lasts 20 days or more between charges Five different soothing sounds and vibration modes so you can find what combination works best for your child Waterproof exterior can be easily removed for machine washing CertiPUR-US foam meets standards for content, emissions, and durability Use Lullabee until your child outgrows the crib Manufactured in the USA Still have questions? Contact us and we'll get back to you as soon as possible!