If mom has a severe postpartum hemorrhage, her pituitary gland (in brain) is 
affected by lack of blood supply and/or thrombotic infarction and necrosis 
causing Sheehan's Syndrome.  Lawrence says it occurs in 0.01%  to 0.02 % of 
pp women.  She gives an excellent description of what happens.
Anterior Pituitary produces the hormone prolactin, which tells the breast to 
make milk and the Posterior Pituitary produces oxytocin which tells the 
breast to release milk.
Sheehan's may be temporary as some of the Lactnetters have written about or 
it may be so severe that milk production simply does not happen at all.  It 
depends on the degree of damage to the pituitary.  The mother will also have 
other problems post hemorrhage as described by others.
Actually I suppose the cases described as "temporary" need another name 
because true Sheehans means no milk production period.  Pat in SNJ 

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