South Yorkshire Police have charged two men, aged 19 and 38, and two women, aged 20 and 37, with murder after a baby girl was found stabbed to death at a residence on Holywell Heights in Sheffield's Wincobank area. The newborn was discovered on Sunday morning after police responded to reports of concern for her safety. In addition to murder, the four individuals are charged with causing or allowing the death of a child and perverting the course of justice for allegedly taking steps to conceal the killing of an infant.