December 04, 2015 06:10 PM

By adding a baby to her real-life “Family Portrait,” Pink got a whole new lease on life.

“I have lived a lot of life in a very short time, and you get hardened a little bit — you get jaded, you build up walls. And when you see this little kid, and you get to watch them through infancy to toddler to little person, it’s amazing,” says the singer, who opens up about her UNICEF ambassadorship appointment in this week’s issue of PEOPLE.

Pink and her husband Carey Hart are parents to 4-year-old daughter Willow Sage.

“You see how you were. When you watch this bundle full of love and light that’s untarnished and untainted by heartache and any of the numerous things that change you, it’s very healing. It’s a miracle,” adds the star, 36.

Michael Crook/UNICEF

While the new UNICEF ambassador is working to battle malnourishment and advocate for healthy lifestyles across the globe with the organization’s new Kid Power initiative, at home, she’s fostering a philanthropic spirit in her daughter, too.

“I want her to be a global citizen. She’s very aware of the fact that not everybody has a bed to sleep in at night and food on their table and coats on their back. It’s hard for her to understand. I want her to be 4, you know? I don’t want to give her anxiety issues,” says Pink.

Michael Crook/UNICEF

Michael Crook/UNICEF

And despite her daughter’s young age, she’s still learning how to give back. Adds the Grammy winner: “We donate. When one new toy comes in, eight go out. And she loves being in charge of that. She loves looking around and going, ‘Okay, I’m ready to give this one up, Mama.’ “

For more on Pink and her involvement with UNICEF, pick up the new issue of PEOPLE, on newsstands now.

— Jeff Nelson

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