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@elizabeda777 Mosaics don't apply to the ABO classification (they're in the RhD group). If the parent was a chimera as you describe, that's possible - to have DNA with O blood, but DNA with B blood in the reproductive organs, and pass that on to the baby. At least one grandparent would need to...

@emilyosu As another person said, O+ and O+ can only make O+ or O-, barring the incredibly rare possibility of a spontaneous mutation in baby's DNA. I've got general biology higher education training but I don't specialise in blood or genetics so happy to be corrected by someone more...