The answer is the Church's current policy of baptizing any infant whose parents promise to rear him in the Catholic faith. (firstthings.com)
In the predella, or bottom border, it shows Martin Luther preaching Christ crucified to his Wittenberg congregation; in the triptych's left wing, Philipp Melanchthon baptizes an infant; in the right wing, Johann Bugenhagen exercises the power of the keys in confession; and in the center panel, Jesus feeds a morsel of bread to Judas (reception by the unworthy!) (religion-online.org)
Some pastors now introduce a newly baptized infant as a new member of the family of God, a brother or sister in Christ. (religion-online.org)