what are the social development and foundation of behavior laid in childhood?

Answer 1

The first 5 years of learing is the real foundation.
He should be taught to be kind, respect for others, Godliness, Hardwork , cleanliness, universal brotherhood.
Most importantly to Shun violence and embrace Peace.
You must be thinking whether it will help him, rest assured these will be his guiding principles for life.

Answer 2

to respect other for the social life in their world and make them see what the world has for them to learn,
by going to school and finding the world in books and school and jobs.