Bloody diapers (breast milk colitis) is usually attributed to allergy, 
often to cow milk protein in mom's milk. It seems to start with the gut 
becoming irritated from lactose overload (oversupply leading to 
"foremilk" predominance), and the gut damage allows proteins to get in 
and start allergy, which leads to more irritation and bleeding.
Reducing milk supply so that the baby gets a better balance of sugar and 
fat, temporary cow milk (or whatever the allergen is) elimination by the 
mother, and in very severe cases a few days or a week of neocate feeding 
while mom maintains her supply seems to take care of it.

I don't know if research has proven the above, but treating it this way 
fixes it for the babies in my practice.

Do let us know what you learn.
Catherine Watson Genna, BS, IBCLC  NYC

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