Its only hormonal birth control such as combination birth control pills that will actually cause changes to the breast size (Alesse, Yaz, and Yasmin to name a few) that contain both estrogen and progestin. Other hormonal methods include the birth control shot, and IUD implant.
Does the pill increase breast growth?
Starting to take the pill can stimulate the breasts to grow. However, any increase in size is typically slight. Within a few months of taking the pill, the breasts generally return to their regular size. This usually also happens if a person stops taking the pill.