Brenda, I tell parents that they can reuse bottles of breastmilk if not
finished.  This is based on the study from I believe North Dakota.  This is in the
LACTNET archives.
Human milk has live cells which include while blood cells and all their
wonderful organism fighting properties.  There has been no study to indicate that
reuse of human milk is bad for our babies.  This is why I ask parents not to
mix formula with breastmilk.
Ann Perry RN IBCLC
Boston, MA

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