A three-month-old baby immediately stops crying when hearing the sound of his parents’ voices or the first time after having his hearing aids turned on. Mason Barnes’ family discovered he was deaf when he was two months old leaving his parents wondering if he would ever hear their voices. But just a few months later, at Children's Healthcare of Atlanta, in Kennesaw, Mason was set to be fitted with his first hearing aid. With Mason sat on her lap, mom Brooke, 24, was encouraged by staff to rock her son using her knee, given that the experience was likely to be an uncomfortable one for him. Sure enough, Mason began to cry as soon as the nurse tried to fit his hearing aids - but then, once they were switched on, something magical happened. As Brooke and her husband Jacob, 25, began to speak, Mason immediately stopped crying. The youngster’s response left his parents shocked - so much so that Brooke decided to share a video of the moment through the family’s social media channel, The Barnes Bunch.