Psychologists think such ingrained altruism has evolved as a consequence of our species' dependence on group living for survival.

"Train up a boy according to the way for him & he will not turn away from it."-Proverbs This scripture shows the importance of good instruction which is done not only by word but by more importantly by action. As another saying goes, 'Actions speak louder than words."

I think it also shows infants are smarter and more observant than they thought they were.