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Breast size can vary from person to person although several deciding factors are usually the amount of breast tissue, body fat percentage, heredity and if you have been pregnant. After our breasts enlarge due to pregnancy they usually shrink postpartumly, called involution. Other changes result from having breastfed, estrogen and progesterone supplementation in the form or shots, implants or medications, hormonal disorders, menopause and lastly age. As we age our skin thins, we lose breast volume due to the shrinking of our lobules due to a decrease in hormones. We also lose body fat in areas where we want it, and seem to somehow selectively gain it where we do not.