That text has no reference to Baptism. Christ’s purpose there was to insist upon humility. He impressed the moral lesson that only such as cultivate the dispositions of a child before God will enter Heaven. But he never said that all children, even the unbaptized, will necessarily go to Heaven. He would contradict His own doctrine if He said that. And if the text had any reference to the Baptism of children at all, it would tell against your position. You have no right and no warrant to refuse baptismal regeneration to children who have had their natural birth, but not their supernatural rebirth.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty