Question

how do children develop sensitivity toward other​

Answer 1

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➦ Children are born into this world with blank brain(without any knowledge). They just observe people and environment and download the information that what are the requirements to live in this planet, as their mind is at Delta state. They don't know anything that what is bad or good. They just download it into their mind.  

As child grows, the child observes the emotions and compassion from their parents and from the environment at the Theta state of mind which helps them develop their sensitivity towards others.