Developed by an advisory board of paediatrians and sleep specialists, Cloud b's 3-stage Sleep System is designed to help baby sleep safe and sound through their first year. This item is a must have for all new parents. Click here to see color swatches. Cloud b Designer Cloud B Online Exclusive! The Cloud B Sleep System features a small and a large LullaBag with a matching super soft flannel LullaWrap. This complete Sleep System takes baby from birth to 18 months (or up-to 35 inches) sleeping safe and sound through the night. The Sleep Systems come packaged in our exclusive Cloud B cradle which is ideal for storing diapers and changing table items.