Thanks to 3-D printing technology baby born with a defective windpipe now has hope of breathing normally, Fox News reports.

Garrett Peterson, now 18 months old, was born with tracheomalacia – a condition that caused his trachea to be so weak that it collapsed easily, leaving him unable to breathe.

A biomedical engineer who runs the university’s 3-D printing lab, Green designed a device that can hold open Garrett’s windpipe until it’s strong enough to function independently. After taking a CT scan of Garrett’s windpipe to make a replica of it, they made the “splint” with a 3-D printer.

"It's like a protective shell that goes on the outside of the windpipe, and it allows the windpipe to be tacked to the inside of that shell to open it up directly," Green told NPR.

Because Garrett’s condition was critical and his survival in question, Green and Hollister had to convince the Food and Drug Administration (FDA) to give them an emergency waiver to use the unapproved device. Then, on January 31, Garrett had his surgery.

Surgeon Dr. Richard Ohye opened up Garrett’s chest and saw that his windpipe had completely collapsed and one of his lungs was completely white—a condition Ohye had only seen in dead bodies. After eight hours of surgery and careful placement of a splint on either side of Garrett’s windpipe, it was time for the big test: What would happen when they let air flow through the windpipe into Garrett’s lungs?

To everyone’s relief, Garrett’s windpipe stayed open, and his white lung turned healthy pink color.

Garrett has gotten stronger and needs less assistance breathing in the weeks since his surgery.  His parents are overjoyed, saying he’s starting to act more interactive and alert.

As Garrett grows, the splint will expand and eventually dissolve in his body as his own windpipe strengthens enough to work independently.