Dawson was born with Poland Syndrome, a disorder which leaves the affected individuals with missing or underdeveloped muscles on one side of their body. There is no known cause, and treatment varies depending on the severity of the symptoms.

For Dawson, it manifested as underdeveloped pectoral muscles and three missing or underdeveloped fingers on her right hand.

That’s where UNLV came into play. Four years ago, the Dawsons reached out to the school’s Howard R. Hughes College of Engineering, which utilized the continuing advancements of 3D-printing to design multiple 3D-printed hands for Hailey to use – giving her the ability to hold and carry things and, yes, to throw a baseball.