James Harrison has been estimated to have saved over 2.4 million babies!

After needing 13 liters of blood for surgery at the age 13, James Harrison pledged to donate blood once he turned 18, the then-required age. When he did so, doctors realized that he carries a rare immune globulin that can prevent unborn babies from suffering attacks by their mothers’ antibodies, a condition known as Rhesus disease.

In the 60 years since, Harrison has given blood more than 1,000 times, an average of once every three weeks for five decades, and his donations have saved an estimated 2.4 million babies.

This has earned Harrison a spot in Guinness World Records. He calls this “the only record that I hope is broken.”