Everyone’s breasts are different. Some women, who are prone to getting lumps, may have a usually benign condition called fibrocystic breast disease. Any time you find a lump you should see your doctor, just to make sure it isn’t something more serious. As for breastfeeding, the lumps shouldn’t be a complication. You just want to make sure that a lump isn’t a plugged duct that could lead to an infection, so definitely talk to your doctor and a lactation consultant.