All of these passages point to the childlike wonderment, but I couldn’t think of just a single verse.
I thought of this story because the children were so excited and filled with wonder to see Jesus, they started running around and shouting praises without any inhibitions.
Matthew 21:15-16 (Living)
But when the chief priests and other Jewish leaders saw these wonderful miracles and heard even the little children in the Temple shouting, “God bless the Son of David,” they were disturbed and indignant and asked him, “Do you hear what these children are saying?”
 “Yes,” Jesus replied. “Didn’t you ever read the Scriptures? For they say, ‘Even little babies shall praise him!’ ”
This points out that it pleases God for children to experience things with more understanding than an adult.
Matthew 11:25-26 (Living)
And Jesus prayed this prayer: “O Father, Lord of heaven and earth, thank you for hiding the truth from those who think themselves so wise, and for revealing it to little children.  Yes, Father, for it pleased you to do it this way! . . .
These next two point out that God wants us to come to Him like a child. Maybe He wants us to experience all of life like a child!!!!
Matthew 18:1-4 (Living)
About that time the disciples came to Jesus to ask which of them would be greatest in the Kingdom of Heaven!
 Jesus called a small child over to him and set the little fellow down among them,  and said, “Unless you turn to God from your sins and become as little children, you will never get into the Kingdom of Heaven.  Therefore anyone who humbles himself as this little child is the greatest in the Kingdom of Heaven.
Luke 18:16-17 (NLT)
Then Jesus called for the children and said to the disciples, “Let the children come to me. Don’t stop them! For the Kingdom of God belongs to such as these.  I assure you, anyone who doesn’t have their kind of faith will never get into the Kingdom of God.”
Love you bunches!