The 36-year-old daughter of former President Bill Clinton and current presumptive Democratic presidential nominee Hillary Clinton lives in New York.
She and her hedge fund manager husband Marc Mezvinsky have a 20-month-old daughter, Charlotte. Both Charlotte and Aidan were born at Manhattan`s Lenox Hill Hospital.
Mezvinsky is the son of former U.S. Rep. Edward Mezvinsky and former U.S. Rep. Marjorie Margolies-Mezvinsky.
On Twitter, Chelsea Clinton said the couple is "overwhelmed with gratitude and love."
Aidan is the second baby to be born to the child of a presidential candidate this year.
In March, presumptive Republican nominee Donald Trump`s daughter Ivanka gave birth to her third child, son Theodore James.
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