Physical Changes During Puberty for Boys

• Height and weight increase.
  
  
• Body hair grows in the pubic area, under the arms, and on the face, and becomes thicker on the legs.
  
  
• Muscles become stronger.
  
  
• Vocal cords get thicker and longer - boys' voices deepen.
  
  
• The body develops an increased number of red blood cells.
  
  
• Sweat and oil glands become more active, and body odor changes.
  
  
• Acne can develop.
  
  
• Some boys develop small and temporary breast tissue.
  
  
• Reproductive system begins to work.
  
  

For more information on the stages of puberty, check out Sexual Development of Boys.

Last revised: March 27, 2009