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    Can someone give me information on parental ABO blood types and the different possible outcomes?

    UPDATE: it was the most likely answer. Grandma was wrong, dad is B+. I’m not sure where else to ask, and it looks like this might be my best bet! I was always under the impression that O+ and O+ would make another O+ but kiddo is apparently B+! From what I’ve read, that suggests that: one of...
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