That doesn't sound right to me.  There is always colostrum toward the end of pregnancy.  It doesn't just run out if it is removed from the breast   The withdrawal of progesterone that occurs with the birth of the placenta, triggers the onset of secretory activation (copious milk production).  I can't see how pumping during pregnancy would affect this hormonal progression.  There is a long history of moms breastfeeding their toddlers through pregnancy and these moms note that the milk changes to colostrum sometime during the latter half of pregnancy.  There is still colostrum at birth just the same as if no baby was nursing during pregnancy.  Secretory activation happens right on schedule though usually a little earlier with subsequent pregnancies, regardless of nursing status of the first child.  There is no evidence to suggest, or reason to assume that the transitional milk would be any different if colostrum was removed during pregnancy.

Laura Spitzfaden, LLLL, IBCLC

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