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Are the antibodies we have against A and B antigens IgG or IgM, or both? I was reading in Lange Micro and saw that we develop IgM antibodies at 3-6 months of age. In another part it talks about where the IgG antibodies cross the placenta. And I'm sure that the anti-Rh antibodies are IgG. So is it just IgG that we have or both IgG and IgM?