red in breastmilk

Yes that's blood. Baka nagsugat nipples nyo. Lagyan nyo lang ng nipple balm before and after latching/pumping para naaalagaan din nipples nyo. Also if pumping, check the flange size of the pump, if tama ang size sa nipple size nyo. Try nyo rin lagyan hot compress boobies nyo and massage them kasi baka may mga baradong capillaries.