Of course, there could be allergy to more than just cow's milk. Usually 
(not always) there'll be other symptoms such as allergy ring around 
anus, eczema, spitting-up, diarrhea, constipation (of course 
constipation itself could cause the blood), colic. I've had moms say that 
prenatal vitamins cause red blood in baby's stools. I've never figured 
out what this could be or been certain of the link (anyone seen this?). 
Some say iron supps to mom too... ? (and red streaks, not black)

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