The amount of fullness that remains after a reduction mammoplasty depends on a few factors. One would be the breast reduction surgeon and the technique used. Second would be the amount of tissue removed and the composition of the remaining tissue. A woman’s age and skin tone are factors. If the woman becomes pregnant, or has significant weight fluctuations breast sagging can happen.
The breasts are subject to changes brought on by aging and gravity. For women who desire the upper fullness, breast implants can be used. Then there are Marin County women who opt for smaller and lighter breasts and they note that the changes are much less with continued use of a bra and stabilized body weight.