Now they were bringing even infants to him that he might touch them; and when the disciples saw it, they rebuked them. But Jesus called them to him, saying, "Let the children come to me, and do not hinder them; for to such belongs the kingdom of God. Truly, I say to you, whoever does not receive the kingdom of God like a child shall not enter it." ( Luke 18:15-17)

Helpful links to related questions/topics

The Little Children and Jesus The Children of the Devil Jesus Befriending and Promoting the Lowly Interactions with Specific People Paul Describes Jesus as a Demonstration of God`s Love The Beatitudes Jesus at the Temple Jesus Feeds the Five Thousand Humility as a Virtue