BGUK_1213403 - London, UNITED KINGDOM - Kate Middleton, Duchess of Cambridge and husband, Prince William pictured with their 3rd child leaving the St. Marys Hospital. Pictured: Kate Middleton - Prince William BACKGRID UK 23 APRIL 2018, Image: 369447209, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia, Xposurephotos