ok here is your ans, 
children are also known as the another face of god on earth.

children are the sole reason for the happiness and joylessness on this world.

they are the one who keeps this world active.

schools , collages universities etc are all running because of these children.

when they are about 4 years old , they are admitted to the schools after which they goes to collages.

their places in the school is replaced by other newborns.

in this way the balance is maintained in schools , collages and othe educational centres.

when a child is born , the family is filled with happiness.

they donate money to ashramas and other places where money is needed.

in this way the birth one one children can help the lives of many other people.

so as a fact children has a great role in this world.