|Blood in your breastmilk is usually from a bleeding nipple, and it can be secondary to trauma from your baby latching-on improperly or sometimes in the third trimester it may occur just before you begin lactating. Bleeding may also be from an intraductal papilloma, a benign condition that usually goes away in a few days. Rarely, bleeding can be from a more serious condition, such as an intraductal carcinoma.
While blood in your breastmilk is usually not dangerous for your baby, it can sometimes cause them to vomit. This can be scary for parents when the vomit also contains the blood that was swallowed, but it usually not concerning. Call your Pediatrician for an evaluation though to be sure nothing else is wrong.
You should call or see your doctor if you have bloody discharge from your nipples.
- When Latching: a great guide to latching on effectively when breastfeeding, with pictures and step by step instructions.