Child begins muscle development, they begin to experience more with their senses. They become more mobile, and learn how certain things affect their body.
2-6 years old
Adolescents and children begin to develop self-esteem. They find out what they liked to do, and what they were good at doing. This leads to their self esteem rising up.
7 and above. Even throughout adulthood, our self-esteem falls, and rises.