Mark 9:36 And he took a child, and set him in the midst of them:
and when he had taken him in his arms, he said unto them,
37 Whosoever shall receive one of such children in my name, receiveth me:
and whosoever shall receive me, receiveth not me, but him that sent me.


Mark 10:14 ...Suffer the little children to come unto me,
and forbid them not: for of such is the kingdom of God...
16 And he took them up in his arms,
put his hands upon them, and blessed them.


It is a blessing for us to make the little children happy although we might need to sacrifice little of our time and effort.

Jesus loved the little children, he had a merry heart to love and accept them. And the children knew it, as children are generally attracted by loving and cheerful adults. They felt comfortable with Him and loved to stick with Him wherever He goes.=)