Early Childhood - from birth to age eight:
This is the most stage in which children develop their psychology and actually skills and abilities. their size and weight will increase Incredibly from their birth to their third year. the head of the baby consists of a one fourth of the complete body length, but this will change as the baby is growing up untill they look like little grownups at 3 to 8.
Childhood from ages 8 to 12:
In this age development will become a little more stable and slow, but at the start of the adolescence by 12, new body changes is going to appear. these changes differ from person to other. Some start at 9 while others wait this changes until 12. but females start earlier in the most.
Adolescence stage from ages 12 to 18:
The hormone development that happens during this stage, causes another fast level of kids developing, During it a kid can grow up to 4 to 7 inches in size and about ten pounds in weight per season.