Dictionary of Human Evolution and Biology

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Birth

1. act of being born.

2. bringing forth of offspring, as in childbirth; parturition. In studies of development and growth, an event in the human life cycle that occurs at about 36-38 weeks post-conception that is marked by a decreased dependency of offspring on the mother for oxygen, heat, and the removal of waste products, but a continued dependency for many other factors necessary for continued growth and survival.

See altricial and precocial.

Cf. death.

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