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A 25-year-old female asked:

How can a baby be born with a different blood type than the parents?

2 doctor answers3 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Happens all the time: That's normal and happens all the time. Some combinations are not possible, such as 2 a biological parents having a b baby.
Dr. Richard Pollard
Anesthesiology 30 years experience
Genetics: The parents have blood types that are made up of two alleles. That is to say they have a blood type made up of a, b or o. Each parents have two of these alleles. Mom could be aa, ab, ao bb, bo or oo, and so could dad. Once these match up they give the baby its blood type. Mom is oo and dad is ab, then baby could be either bo or ao, that will be reported as type a or b. Hope this helps.

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Similar questions

A 34-year-old member asked:

Can a baby have a different blood type than both of his parents?

2 doctor answers5 doctors weighed in
Dr. Mark Diamond
Pediatrics 46 years experience
Yes: Type ao mom and type bo dad can have type o baby, for example.

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Last updated Apr 24, 2015
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