Dear Cindy, Since my last post to you I have done some more reading and have been in contact with an immunology researcher in the UK at Cambridge (he does not want to get involved in giving out medical advice, but did answer some of my questions, and quite promptly, too). It is unlikely that there is any transfer of IgG antibodies (the ones that cause this condition) through the baby's gut. If there were, it would only happen during the first day or two of life. However, the half-life of these antibodies is many weeks, so that they could persist in the blood for months after birth, although this factor has been decreased somewhat by the exchange transfusions which have already taken place. Whatever the reason is for the continuing anemia - lingering effects of IgG, bone marrow suppression, etc. - it does not seem possible that it is linked in any way to breastfeeding. I would ask the doctor for references to support this theory. Please let me know what happens with this and if any of the tests I mentioned previously have been done. You have piqued the curiosity of the medical technologist in me. Sharon Knorr Lactation Consultant Services Rochester, New York mailto:[log in to unmask]