What are the 12 stages of life?

The major stages of the human life cycle are defined as follows:

  • Pregnancy. The development of a zygote into an embryo and then into a fetus in preparation for childbirth.
  • Infancy. The earliest part of childhood. ...
  • Toddler years. ...
  • Childhood. ...
  • Puberty. ...
  • Older adolescence. ...
  • Adulthood. ...
  • Middle age.

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