Your Child's Changing Voice
The Changing Larynx
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 the lungs and makes the vocal cords vibrate, which in turn produces the sound of the voice. The pitch of the sound produced is controlled by how tightly the vocal cord muscles contract as the air from the lungs hits them. If you've ever plucked a small, thin rubber band, you've heard the high-pitched twang it makes when it's stretched. A thicker rubber band makes a deeper, lower-pitched twang. It's the same process with vocal cords.
Before a boy reaches puberty, his larynx is pretty small and his vocal cords are kind of small and thin. That's why his voice is higher than an adult's. But as he goes through puberty, the larynx gets bigger and the vocal cords lengthen and thicken, so his voice gets deeper. Along with the larynx, the vocal cords grow significantly longer and become thicker. In addition, the facial bones begin to grow. Cavities in the sinuses, the nose, and the back of the throat grow bigger, creating more space in the face in which to give the voice more room to resonate.
As a boy's body adjusts to this changing equipment, his voice may "crack" or "break." This process lasts only a few months. Once the larynx is finished growing, your son's voice won't make those unpredictable sounds.
A Normal Stage of Growth
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