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While modern medical childbirth often involves to speeding up of
labor through various methods, there is evidence that prolonged
labor may have beneficial effects on the newborn. A recent study
found that the umbilical cord blood of newborns whose mothers
experienced a prolonged first stage of labor had higher levels of
several important substances.
Some of the blood factors found to be more plentiful in the babies
born after stressful deliveries were stem
cells and granulocytes.
Granulocytes are certain types of white blood cells, including
basophils, eosinophils, and neutrophils.
Stem cells are unspecialized
cells that are capable of giving rise to differentiated cells.
Researchers note that umbilical cord blood can be used as an excellent
source of stem cells, but that large variations in the quantities
of such cells exist and they suggest that these variations may be
due in part to specific circumstances during labor and delivery.
Researchers conclude that "Longer duration stress during delivery
increased the numbers of nucleated cells, granulocytes, CD34+ cells,
and hematopoietic progenitor cells, possibly by causing mobilization
of various cell populations by endogenous cytokines. As long as
umbilical cord blood harvesting does not interfere with the delivery,
umbilical cord blood collected after stressful deliveries may
provide optimal units for hematopoietic stem cell transplantation."
American Journal of Obstetrics
and Gynecology, November, 2000; 183: 1144-51 and Presented
at the Twentieth Annual Meeting of the Society for Maternal-Fetal
Medicine, Miami Beach, Florida, January 31-February 5, 2000
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