TUMZEE has been designed for babies, from birth to crawling age. The unique design enables babies to be propped up on their stomachs on an incline, which helps reduce the frustration babies incur during this learning experience. Once babies are able to roll over they do not spend any time on their tummies anymore and TUMZEE allows them to spend time on their stomach without rolling over or getting out of it. It also has a "T" support which will keep them from sliding down. Since they are propped up they are able to see the surrounding environment and play with toys developing neck and back muscles as well.  TUMZEE is made of 100% non-toxic EVA foam. It has the softness required for infants to be comfortable laying on it but the stiffness necessary to support their weight.