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Free calculator to predict baby blood type from parents. Calculate possible blood types with genetic inheritance patterns and Rh factor analysis. Our calculator uses Mendelian genetics to determine all possible ABO and Rh blood type combinations your baby could inherit from parent blood types.
Last updated: February 2, 2026
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Baby's Possible Blood Types
Explanation:
Based on parent blood types A+ and B+, the child can have 8 possible blood types: A+, A-, B+, B-, AB+, AB-, O+, O-.
Blood Type Probabilities:
Rh Factor Inheritance:
Both parents Rh+: Baby can be Rh+ (most likely) or Rh- (if both parents carry recessive gene)
Genetic Inheritance:
Blood type is determined by inheriting one ABO allele from each parent. A and B are codominant, while O is recessive.
Blood Type Genetics:
Child's blood type
O only (100%)
Both parents pass O allele - child must be type O
Possible types
A (75%), O (25%)
If both parents carry hidden O allele (AO genotype)
Possible types
A, B, AB
Type O baby is impossible from two AB parents
Possible types
A, B, AB, O
All four blood types possible (25% each)
Key rule
Rh+ dominant
Two Rh- parents = 100% Rh- baby
Special types
O-, AB+
O- universal donor, AB+ universal recipient
Most variable combination - all blood types possible:
Our blood type calculator uses Mendelian genetics to predict possible blood types for offspring. Blood type is determined by ABO genes and Rh factor genes inherited from both parents, following established patterns of genetic inheritance.
Blood type follows predictable inheritance patterns. The calculator considers all genetic combinations to determine possible blood types and their probabilities based on parental genotypes.
The ABO blood group system is based on the presence or absence of A and B antigens on red blood cells:
Explore more genetic and pregnancy tools like our adjusted age calculator and HCG weeks calculator.
Get Custom Genetics CalculatorBoth parents type O
O (100%)
One type A, one type B
A, B, AB, O (25% each)
One type AB, one type O
A, B (50% each, NO AB or O)
Both parents Rh negative
Rh- (100% negative)
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