"In our teaching we emphasize that children are a blessing from God and couples should beware of false materialistic standards of measuring the quality of their lives. Forms of birth control that are really methods of inducing a very early abortion must not be used. WELS, however, does not maintain that there is a clear scriptural prohibition against all forms of contraception. Such factors as the mother's health may be a valid concern of couples, which may lead them to consider limiting the number of their children."
January 1, 1970
https://en.wikiquote.org/wiki/Christian_views_on_birth_control