Chelsea Clinton says daughter Charlotte clueless about incoming sibling

BOSTON, Jan. 12 (UPI) -- Chelsea Clinton says her daughter, 15-month-old Charlotte, has no idea she's about to become a big sister.

Speaking with the audience at the American Library Association Conference in Boston on Monday, the pregnant vice chairwoman of the Bill, Hillary and Chelsea Clinton Foundation said she's trying her best to try to make Charlotte understand before she gives birth in the summer.

"I don't think she has any idea what that means yet, but we're talking about it a lot," she said. "She says 'baby,' and then points to herself!"

During her speech, Clinton, 35, touched on her family's love of reading and fielded a question about running for office.

When asked whether she'd follow in her parents' footsteps, she said she understood why that would be a natural curiosity.

"I always answer the question the same way. I absolutely understand why you're asking me that question. My last name is Clinton. My dad was president. My mom's running for president. I understand," she said. "But you also should be asking yourself this question. That's a question every one of us should be asking ourselves."

Clinton and her husband, Marc Mezvinsky, announced in December that they are expecting their second child. The baby's birth is expected to coincide with the Republican and Democratic national conventions in July.