UNPREDICTABLE • E-FREE TRANSLATION.COM • Definition of Unpredictable

... to be girls than boys, and to be born later rather than earlier in the mother's married life. Thus it is three times more likely that a woman of thirty-eight will give birth to twins than that a woman of twenty-four will do so. Should you fear that the unpredictable appearance of twins will unbalance your baby budget, you can, for a moderate sum, insure yourself against this chance with many of the larger insurance companies. The insurance must be taken out before the existence of twins in the uterus can be diagnosed—that is, in the first ...

— The Good Housekeeping Marriage Book • Various