Former first daughter Chelsea Clinton tells PEOPLE Charlotte "opened more space in my heart"

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Charlotte Clinton Mezvinsky doesn’t celebrate her first birthday until Sept. 26, but mom Chelsea is already thinking about giving her a sibling. Or two!

The former First Daughter spoke with PEOPLE ahead of the Sept. 15 launch of her first book, It’s Your World: Get Informed, Get Inspired & Get Going!, a primer for middle-schoolers on issues like poverty, health care and wildlife conservation, and how they can get involved in making a difference in the world.

In the interview, which appears in the new issue of PEOPLE on newsstands Friday, Clinton shares how being Charlotte’s mom has changed her world.

“I didn’t know I could care more intensely about anything until I became a mom. Somehow I love my husband even more, I love my parents even more. I feel even greater urgency about the work that I do, particularly around women and girls being a mom of a daughter,” she explains.

“And I think my love for Charlotte has just opened more space in my heart and my brain that I didn’t even know was there.”

Chelsea Clinton Welcomes Daughter Charlotte


Jon Davidson/Office of President Clinton

The new author and vice chair of her family’s foundation also gives a rare glimpse into her and Marc Mezvinsky‘s home life with Charlotte.

After working from home when she was on maternity leave and breastfeeding, Clinton says she is now in the foundation’s midtown Manhattan offices every day. But she and her husband, a hedge fund executive, “work hard to be home so we can give Charlotte a bath and put her to bed.”

And while Clinton praises Mezvinsky as a “very hands-on” dad, she says that he draws the line at changing diapers — unless he’s the only one home with the baby.

“I don’t mind. I really don’t!” Clinton says of her unequal share of diaper duty. “She’s just so cute!”

As for her husband, she promises that the diaper issue is the exception to the rule: “I tease him about [it] because it is the exception. He’s so attentive, he’s so engaged with her, reading to her, helping her get dressed, getting her into her pajamas at night, helping give her a bath. Everything else.”

For more from Chelsea Clinton, pick up the latest issue of PEOPLE, on newsstands Friday.

— Sandra Soberaj Westfall