This is hard to answer. With surgery now a days, they can make breasts extremely large! Plus, when a woman loses weight, her breasts shrink a little. When she gains weight, they grow a little. I've seen bra sizes to "G."
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There is no way to determine how big breasts may grow during pregnancy. Everyone is different so everyone will see different breast size increase during pregnancy. Some women's breasts do not increase at all during pregnancy.
It really depends on the woman. But as a general rule you will probably increase one or two cup sizes.
Breast size, from whatever reason, be it genetics, fat gain, or pregnancy is totally dependent on the characteristics of each specific woman.
There is some enlargement of the breasts during pregnancy. The milk forming glands develop in size to prepare for the nourishment of the new comer.
They're going to get a couple sizes larger, no matter how many babies you're carrying.