The birth of a child is a joyous occasion. But for the parents and grandparents of little Sophia Riis-Christensen of Sioux Falls, a shadow appeared over their joy very quickly with the realization that their sweet baby had been born with a very rare cancer. To save her life, her leg had to be amputated at just two months of age. She continued to be treated with chemotherapy weekly thereafter for more than a year to ensure there were no stray cancer cells waiting to cause more trouble.  Thankfully, Sophia is in remission and learning to use her prosthetic as she explores the world.