The growth period of a child is the period from birth to the end of adolescence, which is further subdivided into the following main stages. The first is infancy, which is the period from birth to 1 week of age, and is known as the infancy period, a period of very rapid development of children. Next is the early childhood period, which is the period between 1 and 3 weeks of age. In addition, there is the preschool period, which is the period between 3 and 7 years of age, when children mainly live and learn in kindergartens. In addition, the school-age period is the period between elementary school and puberty. Finally, there is adolescence, which ranges from 10-20 years old.