The smile of a child makes any heart happy, giving joy to a child is something that enhances any heart, it must be why our Lord Jesus Christ said:

"And they brought children to him to be touched, and the disciples rebuked those who presented them." Jesus, seeing him, became indignant and said to them, "Let the children come to me, and I will not tell them." you prevent, for such is the kingdom of God, verily I say unto you, that he that receiveth not the kingdom of God as a little child shall not enter in. And taking them in his arms, laying his hands upon them, he blessed them. " Mark 10: 13-16