Further complicating things is the fact that the incidence of aneupolidy is random . One month a woman opting for egg freezing may be stimulated to produce 12 eggs and none will be normal . The next month , the same woman might produce six that are normal . The key to a successful outcome is freezing only the euploid eggs . In contrast to the scattershot approach of freezing every egg harvested - a minimum of 20 at most centers , ReproCure 's technique requires that only four or five normal eggs be frozen and banked .