'Little Children' in the Bible

To what shall I liken this generation? It is like little children sitting in the markets, who call to their companions,

and said, I tell you truly, that if you do not turn and become like little children, you can by no means enter into the kingdom of heaven.

Then little children were brought to him that he should put his hands on them and pray; and the disciples rebuked them.

But Jesus said, Suffer the little children to come to me, and forbid them not, for of such is the kingdom of heaven.