Trivia Question (American Presidents Blog)

An interesting history-related post from American Presidents Blog:

With finals and spring cleaning (yes, I do have a life that doesn't include history....although right now I'm moving books and I own a lot of presidential histories....hmmmm....), I've been behind, so here's a trivia question.  Let's see who can get it!  Who is the only presidential child born in the White House?

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