There is a lovely story in Matthew 19 where Jesus welcomes little children and spends some time with them and encouraging that to such as these belongs the Kingdom of Heaven.
13-15 One day children were brought to Jesus in the hope that he would lay hands on them and pray over them. The disciples shooed them off. But Jesus intervened: “Let the children alone, don’t prevent them from coming to me. God’s kingdom is made up of people like these.” After laying hands on them, he left. (The Message)
Consider Jesus' words in Matthew 18: 1-5:
Who gets the highest rank in God’s kingdom?”
For an answer Jesus called over a child, whom he stood in the middle of the room, and said, “I’m telling you, once and for all, that unless you return to square one and start over like children, you’re not even going to get a look at the kingdom, let alone get in. Whoever becomes simple and elemental again, like this child, will rank high in God’s kingdom.
What exactly is it about children, childlike faith that the Kingdom of God belongs to such? In this video, Michael explores a couple of these ideas and the difference between being childlike and childish.