Health
Dec 19, 2025 · Cgkik

Baby takes 1st steps after receiving groundbreaking gene-edited therapy

The baby saved from a rare disease by a first-ever personalized gene fix has reached a big milestone, taking his first steps ahead of Christmas.

KJ Muldoon is walking and getting ready to celebrate the holiday season at home with his parents and three siblings.

Children’s Hospital of Philadelphia - PHOTO: KJ Muldoon was the first patient in the world to receive a personalized gene-editing therapy to treat a rare disease. KJ took his first steps recently.

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