Deaf three-year-old Grayson Clamp hears his father's voice for the first time after surgery. His parents, Len and Nicole Clamp say they took a chance after hearing about a surgery called "Auditory Brain Stem Implant" at UNC Hospital in Chapel Hill. Grayson is the first child in the U.S. to undergo the surgery. It involves a microchip implanted in his brain to help him hear. Grayson's parents are now trying to teach him how to process all those new sounds.
Implant lets deaf child hear for the first time
Moving moment boy first hears his dad's voice
Breakthrough medical trial allows 3-year-old to hear for the first time