According to best-books-for-kids.com 

1.Kids who read often, widely get better at it. 

2. Reading exercises our brains.

3. Reading improves concentration

4.Reading teaches children about the world around them.

5. Reading improves a child’s vocabulary and leads to more highly-developed language skills.

6. Reading develops a child’s imagination.

7. Reading helps kids develop empathy.

8. Children who read do better at school.

9. Reading is a great form of entertainment!

10. Reading relaxes the body and calms the mind.

This information is from the following website 

http://www.best-books-for-kids.com/benefits-of-reading.html