1 Doctor agrees with this answer
Hi.. Sagging breast can be treated by various methods.. You have breast firming creams commercially available which can be tried.. Swimming and yoga exercises will help in tightening the chest muscles.. Proper bra is essential..
http://www.lindasonline.com/sagging-breasts-in-bra.html
This url provides information on finding the right bra to prevent sagging.. Hopefully it helps you..