Last summer, Zion Harvey was in a hospital bed at the Children's Hospital of Philadelphia, recovering from a double hand transplant.

This year, the 9-year-old who was the first child in the world to undergo the complicated surgery, is throwing pitches at Major League Baseball games.

Zion, who lives in the Baltimore area, threw the first pitch at Tuesday's Orioles game.

He received the 11-hour surgery at CHOP last July. At age 2, a bloodstream infection had required his hands and feet to be amputated. Before Zion, no child had ever received even a single hand transplant, but the young boy was an especially suitable candidate for the surgery because he was already taking antirejection drugs after a kidney transplant, which he underwent at age 4.

He was released from the hospital late last August, but is expected to undergo outpatient rehabilitation therapy for as long as two years.