1. Difference of more than 5% in the percentage of HbF cells (measured by flow cytometry in the Widness lab) between blood harvested from the placenta and that from discarded neonatal blood in the first day of life and before the first neonatal blood transfusion. This is done to exclude the rare possibility of transfusing newborns with blood that is contaminated with a significant proportion of their mother's blood if a maternal-to-placenta bleed occurs after umbilical cord clamping is done. (This only applies to infant study subjects receiving autologous RBCs from the placenta.)