Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan Markle, Duchess of Sussex, pose for a photo with their son in St George's Hall at Windsor Castle in Windsor, Britain, on May 8, 2019. The baby boy, who is Queen Elizabeth's eighth great-grandchild, is seventh in line to the throne, behind the Prince of Wales, the Duke of Cambridge and his children - Prince George, Princess Charlotte and Prince Louis - and Prince Harry. (Xinhua/Dominic Lipinski/PA Wire)