Anyone who’s been a babysitter or worked as a nanny knows the great responsibility that rests on your shoulders.

Most babysitters take the job seriously, but some go above and beyond what any parent could ask for.

Twenty-two-year-old Kiersten Miles had only looked after George and Farra Rosko’s three children for a few weeks — but when one of the kid’s lives was one the line, Kiersten made a life-changing decision.

And it was a decision that will leave the Roskos eternally grateful.

Kiersten Miles is a 22-year-old student from New Jersey who needed a job to support her studies.

She contacted the Rosko family through a friend and immediately started working for them.

In no time, Kiersten formed a strong bond with the couple’s three kids, and especially their youngest daughter, Talia.

But it soon turned out that the nine-month-old girl had a rare, life-threatening liver disease.

When doctors announced that Talia needed a new liver, Kiersten didn’t hesitate for a second to offer her part of hers.

George and Farra and Rosko weren’t sure about the idea at first. They explained to Kiersten how big of a deal it was.

Thankfully, both Kiersten and Talia quickly recovered, and today, Talia is a new toddler.

Hardly anyone can believe that she recently had a liver transplant. Now, she’s like any other little girl — she runs around, plays, and eats like never before!

Kiersten of course deserves a hug “thank you” for her amazing gesture. Talk about a heart of gold!