Chelsea Clinton announces birth of second child -- a son named Aidan
Hillary Rodham Clinton, former US Secretary of State (L), and her daughter Chelsea Clinton embrace as they attend the 2015 Meeting of Clinton Global Initiative University at the University of Miami on March 7, 2015 in Coral Gables, Florida (AFP Photo/Joe Raedle)

Chelsea Clinton and her husband Marc Mezvinsky announced on Saturday the birth of their second child, a son named Aidan.

"Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky," Clinton said on Twitter. She is the only child of U.S. Democratic presidential candidate Hillary Clinton.

(Reporting by Barbara Goldberg; Editing by Cynthia Osterman)