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Here's what I remember about my research on this from my kiddos: ABO incompatibility occurs when the mother, who is usually type O, manufactures antibodies to her (differently typed) baby's blood. Those antibodies are circulating in the baby to some degree (more with moms who are type O because of the size of the antibody being smaller and more likely to pass through the placenta). After birth, the antibodies destroy some of the baby's red blood cells, which are filtered out by the baby's liver, causing the production of bilirubin and subsequent jaundice.
I am O+ and had a baby (maybe both, never typed the second) with A+ blood. The one I am sure of did indeed have his cord clamped immediately after birth ("emergency" c/s) and the second did not have hers clamped until 8 hours after birth (semi-lotus, but close enough for this question). My take on it is that the benefits the baby receives by allowing the cord to finish pusating are by far outweighed by any possible risks associated with ABO incompatibility. Both mine had jaundice, the second much more than the first, but no treatment was needed. Providers are super-paranoid about jaundice, which while occasionally being dangerous, is in the vast majority of cases not. It does not seem to me that there would be any difference in the jaundice levels between a lotus birth and simply waiting until the cord stopped pulsating, since the blood's been transfused within the first little while anyways. I'm not sure the immediate clamping would actually make any difference, since the antibodies are already in the baby, although I suppose depriving the baby of some of its blood supply would theoretically lower the number of destroyed red blood cells, thereby possibly reducing the level of bilirubin. Doesn't seem to me that that would necessarily be true, and the if it were, it would be beneficial enough to clamp and cut early.
Also, you might research the treatment for jaundice of varying causes, because they do treat different jaundices differently. If I remember correctly, phototherapy is not useful in ABO incompatibility, but I could be remembering wrong.
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