The Tranquilo Mat helps baby transition from a mothers womb to the world during the fourth trimester after birth by mimicking moms heartbeat and motions through gentle vibrations and sounds. Designed to help baby self-soothe, the Large Tranquilo Mat makes naps, sleep training, and crib transition easier. The large Tranquilo Mat is best used for bassinets, cribs, pack and plays, activity mats, play pens, and all those larger spaces where baby likes to sleep and hang out (and cry). Does your baby get fussy at the sight of a crib? Instead of bouncing up and down or driving around the block, try a large Tranquilo Mat! Designed to use anytime, anywhere, the Small Tranquilo Mat makes travel stress-free. Lightweight and compact, it can easily be folded up and placed in a diaper bag. The small Tranquilo Mat is perfect for baby carriers, strollers, car seats (used over baby after he or she has been properly buckled in), and other smaller portable devices. Heading out to the airport or driving to Grandmas house? Our small mat can easily travel with any on-the-go baby.