The Tummy Time Activity Mirror is part of a new range of toys developed to encourage babies to reach when playing, helping them to develop the muscles needed for rolling over, sitting up and crawling.Why Tummy Time? Tummy Time plays a pivotal role in the full body muscular development while preventing 'flat head' syndrome in infants. Infants can see black and white before any other colours during their first three months of life. The contrast of black and white stimulates and urges infants to fo