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Why do boys' voices change?
Congratulations! You're experiencing yet another facet of puberty. You know - that time during which your body is changing and growing into an adult's. What causes puberty? Your body starts producing chemicals called hormones which set all kinds of changes in motion. Among the many physical and mental changes that you have been, and will continue, experiencing are new body odors, growth spurts, pimples, sexual feelings, changing emotions, facial hair - and enlarging muscles.
Guess what? Your vocal cords are muscles and during the course of puberty, your vocal cords are growing thicker. And in the long run, they'll almost double in length! Like guitar strings, vocal cords vibrate when contracted as air passes them. What sound they make is determined by both how thick the vocal cords are and how much they have been contracted. But, in general, the thicker the muscle, the lower the tones created when they vibrate. In other words, the thicker the vocal cords, the lower the voice.
If your voice is sounding squeaky, that's because you haven't yet learned how to control these changing muscles. But don't worry, that control will come naturally and pretty soon!
Oh, don't think that girls are spared all these changes. Obviously, they go through them too. In fact, the pitch of their voices also changes - but the change is simply not as dramatic as a boy's.
Puberty may sometimes feel difficult but it's just a part of your journey to adulthood.