Yesterday, your son sounded like he's always sounded — like a
boy. But today, you heard that first crack in his voice. He's
started puberty and several things about him are changing. Along
with obvious changes in physical appearance, his voice will
start sounding a whole lot different. For a while, he might have
difficulty controlling it and he'll make all sorts of odd noises
when trying to speak. It's the larynx (or voice box) that's
causing all that noise. As the body goes through puberty, the
larynx grows larger and thicker. It happens in both boys and
girls, but the change is more evident in boys. Girls' voices
only deepen by a couple of tones and the change is barely
noticeable. Boys' voices, however, start to get significantly
deeper. The Science Behind the Squeaking The larynx, which is
located in the throat, plays the major role in creating the
sound of the voice. Two muscles, or vocal cords, are stretched
across the larynx and they're kind of like rubber bands. When a
person speaks, air rushes from t