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For acquired maternal IgG antibodies (which may also be transferred postnatally through breast milk), assessing the antibody specificity (AbS) in the newborn, as previously mentioned, appears to be a reasonable approach. In addition, the Direct Antiglobulin Test (DAT) remains key, and performing an elution is important (even if the DAT result is negative). In your case, the negative DAT suggests that either the anti-N antibody did not cross the placenta, possibly due to being a naturally occurring IgM, and/or the baby is N-negative.