
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.
KJ was born last year with a genetic disorder called carbamoyl-phosphate synthetase 1 deficiency. Also known as CPS1 deficiency, the metabolic condition affects only 1 in 1.3 million babies and often leads to life-threatening outcomes.
When he was 6 months old, doctors began giving KJ a groundbreaking new treatment -- a personalized CRISPR gene editing therapy at Children's Hospital of Philadelphia.
Doctors save baby's life with first-ever gene fix for deadly rare disease
The gene-editing therapy works like a "molecular spell-checker,” finding and fixing the specific genetic error causing his condition.
After three infusions and after spending the first 10 months of his life in a hospital, KJ was discharged and sent home in June.
Baby saved by gene-editing therapy 'graduates' from hospital, goes home
Since then, KJ has continued to grow and thrive with his family, celebrating his first birthday at home and taking part in one of the family’s favorite rituals -- cheering for their beloved Philadelphia Eagles.
Doctors hope new technology like CRISPR gene-editing therapies can be the key to treating more than 7,000 rare diseases, such as sickle cell disease, cystic fibrosis, Huntington’s disease and muscular dystrophy, that affect approximately 30 million people across the country.
LATEST POSTS
- 1
Ukraine apologizes to Finland for crashed drones - 2
'Spending more on gas than groceries:' Rising fuel prices drive more San Antonio families to the Food Bank amid Iran war - 3
France to build new nuclear aircraft carrier, Macron says - 4
Timex Gives Its Classic Affordable Field Watch a Tactical, Milspec Makeover - 5
The Response to Independence from the rat race: Methodologies for Creating Financial momentum
The Secret Side of Italy: 12 Underrated Destinations Locals Don’t Want Tourists to Find
Fact Check: Some Bridge Photos Circulating Do NOT Show The Hongqi Bridge That Collapsed In Southwest China Nov. 11, 2025
Are your hormones imbalanced? Doctors explain how to know if you need testing
WATCH: IDF strikes, dismantles missile launchers in southern Lebanon
This country music star spent years hiding his sexuality. Coming out — and beating addiction — has made his soul feel '20 pounds lighter.'
15 Outrageous Cosplay Outfits That Will Blow You Away
As infant botulism cases climb to 31, recalled ByHeart baby formula is still on some store shelves
Israel says Iran's military industry will be destroyed 'within days'
It's your last chance to subscribe to Paramount+ before they raise their prices: Here's how to lock in current pricing












