Stage 1: Infancy/Toddler
This stage occurs from birth to 2 or 3 years of age.
-Sub stage of infancy (0-1)
In this stage the most marked growth in humans occurs compared to any other stage. During this stage babies triple their weight. The chest cavity and head grows rapidly to allow the brain, heart and lungs to develop quickly. The bones harden and muscle development occurs. Some motor tasks at this age are grasping objects and crawling.
-Sub stage of Toddler (1-3)
In this stage growth slows down but body still gains in mass and length. Motor tasks include walking, running, using utensils, climbign stairs, turning pages of a book.
Stage 2 Childhood (4-10)
-Sub stage of childhood
Rapid growth is still occuring.
-Sub stage of mid-childhood (6-10)
In this stage there is a stabilizing period in which a uniform relationship between bone and tissue growth and development occurs. This establishes an important base for motor skills.
Stage 3 Puberty/Adolescence (11-18)
During this stage growth speeds up ("growth spurt"). Both genders develop in sexual maturity.
-Sub stage of puberty (10-15)
Puberty occurs when the pituitary gland secretes hormones that cause the sex organs to develop. It occurs slightly earlier in females.
-Sub stage of adolescence
During this stage the body adjusts to rapid changes experienced in puberty This is a time of major psychological changes.
Stage 4 Adulthood (18-..)
By this time most of the bodies growth has taken place. Many more changes will occur as adults continue to age which are mainly caused by external factors.
Factors affecting Rate of Physical Growth