Is one occurrance of blood in the pump necessarily a major concern?
I have heard that on occasion a capillary may break resulting in a
small amount of blood.  It doesn't take much to make the millk look
quite red.  I wonder how many times this happens when baby is
nursing directly from the breast and we never see it.  Of course
pumping technique and strength can be a reason for blood, but in
some cases it may be very benign.
Winnie RNC, IBCLC - in southeastern WI where we're loosing all our
snow.

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