Here is the link to a great sermon by Sinclair Ferguson on Jesus, Children, and the Kingdom of God. It is the eighth sermon on the player that comes up. It is a helpful exposition of a passage that substantiates Covenant Theology. I remember the first time I came to realize that when Jesus put His hands on the little children and blessed them He was not simply showing kindness to children. As the Covenant LORD, He was giving them the covenant blessing. The parents of these children were bringing their children to the Lord Jesus Christ late in His ministry, after most had rejected Him. These children were the children of believing parents, no doubt!