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What are the physical changes that take place in boys?

A boy's voice gets deeper, his muscles develop and his chest gets broader. Hair starts to grow under his arms, and on his legs and face. In due course he will need to start shaving.

During this time his penis and testicles will also grow bigger and longer. Hair, often called pubic hair, will also start to grow at the base of his penis. He will start to have erections and he may have wet dreams.
What is an erection?

An erection is when a boy's penis hardens and lengthens. Most erections are not straight, and tend to either have a curvy bend upwards or to either side. Many boys worry that their penis is smaller than other boy's, but most penises are around the same size when erect.
What is a wet dream?

A wet dream is when some semen (the sticky liquid that sperm is part of) comes out from a boy's penis while he is asleep. A boy may remember he had a sexual dream. Or he may just notice a wet patch on his pyjamas or on the sheets when he wakes up.

It is a good idea for a boy to wash his testicles and penis, particularly behind his foreskin if he has one, after he has had a wet dream. Because a boy may develop an infection around his penis and testicles if they are not cleaned regularly, it's a good idea to wash them daily.
What does it mean for a boy's voice to break?

This is just a way of saying that a boy's voice will get deeper. Sometimes it can happen very quickly, perhaps even overnight. Other boys may have a time when their voice is higher at one moment and then lower even a minute later. All boys' voices will eventually settle down and sound deeper (lower pitch).
How often does a boy need to shave?

When a boy first has hair on his face, it is usually just a small amount on his upper lip and chin. This can be removed by shaving it off with a razor. Razors can be bought in most supermarkets and chemists. Using shaving foam or gel before a boy shaves will help reduce any irritation caused to his skin by shaving. At first a boy probably won't need to shave very often. But eventually a boy will probably need to shave every day as this hair starts to grow back quickly.