What are the stages of postnatal human development?

Postnatal human development is a period of independent development of the body, outside the womb. It includes the following stages: newborn (0-28 days of life), this is a very dangerous and difficult period for the baby, since his living conditions have changed dramatically. The next stage is infancy (29 days -1 year of life). It is characterized by the fact that the child feeds on the mother’s breast milk, and the highest growth rate is observed. Then comes the period of early childhood (1-3 years), followed by preschool age (4-7 years), then school age (8-12 years), adolescence, youth, mature, elderly, senile and long-livers.