Anabaptist: But a baby can't believe!
Lutheran: Right. And neither can an adult.
Lutheran: Faith is something GOD gives; His work within us. Always a miracle when it happens! We can't come up with it on our own. And HE doesn't have any more problem dishing it out to babies than to adults; in fact, babies are likely easier, cause their fallen thinker isn't running interference with all its "but, but, buts."
Anabaptist: But, but, but.
Lutheran: Exactly. Want to sing a hymn together? How about: "Lord, 'tis not that I did choose Thee?"!