A few points.  
 
Often the midwives at our hospital use pumping to try to stimulate labor in  
women who are near their due date, and aren't able to in many of them.  
 
Remember that colostrum is concentrated - less water content; some of its  
components are coming from the paracellular pathway - between the milk  cells 
that don't have tight junctions in the early days.  
 
Progesterone, which maintains the pregnancy, competes for the receptor  sites 
on the milk cells with prolactin.  Why isn't there mature milk before  the 
baby is born? { Well, the baby doesn't need it yet, ;-)  } It's  because the 
great amount of progesterone produced by the placenta is blocking  prolactin from 
the receptors on the milk cells.  So I don't think she would  bring in mature 
milk by pumping.

After the birth when enough prolactin is able to attach to the  receptors  
(as the progesterone clears from the circulation)  the milk  cells begin to make 
more lactose, lactose draws water into the cells and  thereby increases the 
milk volume.  Antibodies are still present , but  since mature milk is more 
dilute the baby has to drink more milk to get  the same amount of antibodies that 
would have been in colostrum. So  the baby isn't deprived of antibodies.
 
Mardrey Swenson
 
 
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