Hi,
   I understand your query.
   The tissues develop from what we eat & how we exercise to  strenghthen  underlying muscles ,the process is supported by female hormones.
   Breast enhancing program should have-
   Diet- A well balanced diet containing 
proteins, carbohydrates,fats in optimum proportion with vitamins/minerals.
   Exercises- Regular chest presses enhance breast.You being mother of 5 kids, the sagging breasts problem would be more benefited with exercises.
   Hormones-  natural female  hormone contanining foods like - Soy products,fenugreek, flex seeds & garlic. give good results.
       - Alternatively- cyclical 
estrogen pills taken after a gynecologist's consultation.
      -Breast  enhancercreams can be used along with this.
    Thanks.