A girl from Minnesota, USA, Freya Vinje, is being called the 'happiest baby in the world' after her five-day-old picture, when she was a premature baby weighing about 1.7 kilograms, surfaced online. Born in November 2014, Freya's picture was shared by her mother and was re-posted by 'Love What Matters', garnering over 50,000 shares on Facebook.