You might want try massage using warm water in a small cup with lid and massage your breast area to reduce soreness. Then, pump to bottle fed your 6 months. If you breastfeed, you may change between both breast to fed. Soreness will slowly go away as weeks go by. You can also put some cream from cocoa butter on your nips. But remember not to breastfeed once the cream has been applied. Hope it will helps.