Dear oleku,It is very common to have breast shrink after nursing. Breast growth is related to the following:In general, breasts will stop 'growing' when all other hormone related phenomenon from puberty stop changing. Some women have early puberty and early finishing of these changes, and some women have later and a more prolonged course. However, any changes to hormone levels, such as in pregnancy, nursing, etc. can change breasts, OCP may change growth, certain tumors may affect growth, weight gain will affect size, etc. The breast is composed of the breast gland that grows related to hormone levels of estrogen and prolactin as well as other hormones, but some women's breast tissue have more 'hormone receptors' than other women's and thus are more sensitive to hormone levels. That is why the hormone creams etc do not work on someone who naturally have smaller breasts because they are less sensative to hormones. In addition, the breast is also composed of fat tissue which grows and shrinks with weight gain and loss. So there is no simple answer here. There is not much you can do to increase your breast size short of getting pregnant or gaining weight. The following photo is of a lady who had 3 babies and her breasts dissappeared after nursing. Best Wishes!Pablo Prichard, MD