My son is 7and 1/2 months. For two months I feed him breast milk.After that I started formula because thinking my breast milk was not enough.When I get to 5 month I stupped pumping because the supply was too low. now my son refused to take the formula. Can I have a breast milk after all this time pass?. what shoul I do to have it back?please if you have any advice , let me know.