The difference between adults and children is that adults have learned to sit quietly after you lose their attention. Children are not as phony. If you are a lousy teacher they tend to let you know. They are considerably more authentic. More Humility Jesus made this point in Matthew 18.
Children have a better grasp of their limitations than do adults.
There are reasons why Jesus never asked the children to be more like the adults to enter the kingdom of God. He said it the other way around. Children seldom possess an inflated view of their own ability. They understand that when they come to Jesus it is with nothing in their hands to offer Him. More Participation Children want do be involved.