Why do I have red blood in my milk?
If mothers have blood in their milk, it is most likely from damaged nipples. If the nipples are not damaged and the blood is coming from only one breast, it may be from an intraductal papilloma, a small, non-cancerous growth in a milk duct, or a breast abscess. Breast tumours or cancer can also show up as bloody milk from one breast. A baby who takes in blood by the mouth may have blood or black bits in the spit or very dark or black stools. Blood can also come from bleeding inside the baby. Mothers should see their health-care providers if they notice blood in their milk, on their nipple, or the baby’s spit-up or stool.