Hello! I am sorry to hear about your constant pain. It seems like your spine has been weakened overtime because of repetitive stress and injuries over there course of last few years. Please make sure your posture is always correct while feeding your child and you don't bend forward too much to tend to your child. You need a gradient physical therapy treatment aimed at pain relief initially and then gradual strengthening of your back muscles. This entire treatment should avoid any recurrences bit requires diligence from your end. Please contact us for a consult and treatment.