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Physical Growth & Development During The Teen Years

Washington State Department of Social and Health Services

What’s it all about?

During adolescence, teens grow, change in shape and become capable of producing children. Adults face 2 major issues when looking at adolescent growth and development:

  • Understanding adolescents in the context of their own experiences, as well as the expectations of the adult world.
  • Helping adolescents know if their growth falls within the parameters of “normal,” or when to seek additional help.

Why does it matter?

Adolescents are often asking “Am I normal?” They worry: “I don’t look like my friends.” “I’m too tall/short, fat/thin.” Adults who reassure them and give clear, helpful information can support teens through this confusing and challenging time. Knowledgeable adults can help teens learn to cope with the changes in their bodies and avoid
problems.

Note: It is important to keep in mind that physical and emotional development do not always occur at the same pace. So, although a teen may have the body that looks like an adult, they may still be developing the emotional maturity that goes along with it!

What are the details?

Stage Physical Changes in Girls Physical Changes in Boys
Early (11-14 years)
  • body fat increases
  • breasts begin to enlarge
  • height and weight increases
  • first menstrual period
  • hips widen
  • skin and hair become more oily,
  • pimples may appear
  • underarm hair growth
  • appetite/nutrition changes
  • pubic hair grows
  • testicles grow larger
  • underarm and facial hair growth
  • pubic hair grows
  • pimples may appear
  • height and weight increases
  • muscles develop
  • voice deepens
  • appetite/nutrition needs change
  • breasts can get tender
Middle (15-17 years)
  • usually have reached full physical development
  • increased concern about physical image, weight
  • eating habits change
  • close to full physical development
  • voice continues to lower
  • facial hair appears
  • continue to gain height/muscle
  • eating habits change
Late (18-19 years)
  • few physical changes
  • few physical changes
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