World / Prince William Meet the Newest Princess Kate and William take their daughter home By Newser Editors, Newser Staff Posted May 2, 2015 2:51 PM CDT Copied Kate and William leave St. Mary's Hospital in London with their daughter. (John Stillwell/Pool via AP) See 8 more photos Such royal efficiency. After Duchess Kate gave birth at 8:34am local time in London, she and William left St. Mary's Hospital about nine hours later and showed off their newborn girl before heading home. As USA Today observes, Kate "did not look as if she had just been through labor." No name yet, but this baby is already making history. (More Prince William stories.) Report an error