Matthew Henry on Luke 18:15-17

None are too little, too young, to be brought to Christ, who knows how to show kindness to those not capable of doing service to him. It is the mind of Christ, that little children should be brought to him. The promise is to us, and to our seed; therefore He will bid them welcome to him with us. And we must receive his kingdom as children, not by purchase, and must call it our Father's gift.