I'm an "old" blood banker. The cord blood was probably "negative" because of prozone. The 1+ later some of the antibody site were avalable to react with the AHG. I agree with donellda - LUI eluate is a very easy procedure and one of the best for ABO incompatility. With the baby's H & H dropping is a sign that there is an incompatiblity. Is the mother breast feeding? ABO antibodies are in the mother's breast milk and can still be adsorbed by the baby. I hope the incompatiblity is self limiting and the baby does well. If the antibody is identified, let us know about the out come.