Some lumps are age dependent.
Both male and female newborn infants have lumps of enlarged breast tissue beneath the nipple which have been stimulated by maternal hormones. These disappear within a few months of birth. These lumps are breast buds and are one of the earlier signs of the beginning of puberty. These tend to disappear over a period of 6 months to 1 year. It is also important to remember that hormonal changes just prior to menstruation may cause a lumpy or granular feeling to the breast tissue.