Is it permissible to marry one's maternal cousin if her mother breastfed her—and there is doubt as to the number of feedings, whether they reached five or fewer?

The prohibition of marriage due to suckling is not established except by the fulfillment of two conditions: that the suckling occurs within the first two years of life, and that it consists of five or more sucklings. If it is less than that, or if there is doubt about the number of sucklings, then the prohibition is not established. Nevertheless, it is preferable and more cautious not to marry someone about whose suckling there is doubt, in order to avoid شبهة (suspicion/doubt).