In this module, you will learn:

  • the ages when puberty starts
  • the physical changes during puberty

Resources to help you:

  • Textbook: page 150
  • Notebook: page 41

What is puberty?

Puberty is the stage of growth where your body starts to sexually mature.

In girls, this takes place around 10 to 12 years old while in boys, this takes place around 12 to 14 years old.

Some of the changes are inside your body, e.g. producing testosterone in male and estrogen in female.

Others are physical changes e.g. development of muscles in male or breasts in female.

boy and father with fake moustache

One of the changes in boys in puberty is growth of facial hairs.

Credit: @Sorapop via YayImages

Watch the next 3 videos

See how the body changes in puberty in boys and girls.



Enlargement of breasts is an example of secondary sexual characteristics in girls.

Credit: @cteconsulting via YayImages

Secondary Sexual Characteristics

Secondary sexual characteristics refer to the physical changes in boys and girls during puberty that are not directly related to reproduction.


Changes during Puberty

Physical Changes in Boys
Physical Changes in Girls

Growth of facial, body (chest, armpits, legs) hairs and pubic region

Growth of hairs in the armpits and the pubic region

Shoulders grow broader

Hips widen

Voice deepens (low pitch)

Voice softens (high pitch)

Body becomes more muscular

Breasts starts to grow bigger (enlarge)

Male reproductive organs (testes) starts to mature and produce sperms

Female reproductive organs (ovaries) starts to mature and release eggs (ova)

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