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Blood Group of Baby Calculator

Reviewed by Calculator Editorial Team

Determine the possible blood groups of your baby based on your and your partner's blood types using this simple calculator. Blood group inheritance follows specific genetic rules that can be calculated using the parent's blood types.

How to Use This Calculator

Using the blood group of baby calculator is straightforward:

  1. Select your blood group from the first dropdown menu.
  2. Select your partner's blood group from the second dropdown menu.
  3. Click the "Calculate" button to see the possible blood groups for your baby.
  4. Review the result and any additional information provided.

The calculator will display the possible blood groups your baby could inherit based on standard blood group inheritance rules.

Blood Group Inheritance

Blood group inheritance follows Mendelian genetics. The ABO blood group system is determined by three alleles:

  • IA - Controls production of A antigen
  • IB - Controls production of B antigen
  • i - Controls production of neither antigen (O blood type)

Each parent passes one allele to their child. The possible combinations determine the child's blood group:

Blood group inheritance follows the following rules:

  • If either parent has the IA allele, the child can have A or AB blood type.
  • If either parent has the IB allele, the child can have B or AB blood type.
  • If neither parent has the IA or IB alleles, the child will have O blood type.

Possible Blood Groups

The possible blood groups for a child are determined by the combination of alleles inherited from both parents. The possible combinations are:

Parent 1 Parent 2 Possible Child Blood Groups
A A A
A B A, B, AB
A O A, O
B B B
B O B, O
O O O

Note that the AB blood group can only be inherited if at least one parent has the AB blood type.

Example Calculations

Let's look at some example calculations to understand how blood group inheritance works:

Example 1: Both Parents Have A Blood Type

If both parents have A blood type, the possible blood groups for their child are:

  • Parent 1: A (IAIA)
  • Parent 2: A (IAIA)
  • Possible child blood groups: A

Since both parents are homozygous for the IA allele, all children will inherit A blood type.

Example 2: One Parent Has A and the Other Has B

If one parent has A blood type and the other has B blood type, the possible blood groups for their child are:

  • Parent 1: A (IAi)
  • Parent 2: B (IBi)
  • Possible child blood groups: A, B, AB

The child can inherit:

  • IA from Parent 1 and i from Parent 2 → A blood type
  • IB from Parent 2 and i from Parent 1 → B blood type
  • IA from Parent 1 and IB from Parent 2 → AB blood type

Example 3: One Parent Has O and the Other Has AB

If one parent has O blood type and the other has AB blood type, the possible blood groups for their child are:

  • Parent 1: O (ii)
  • Parent 2: AB (IAIB)
  • Possible child blood groups: A, B, AB

The child can inherit:

  • IA from Parent 2 and i from Parent 1 → A blood type
  • IB from Parent 2 and i from Parent 1 → B blood type
  • IA and IB from Parent 2 → AB blood type

Frequently Asked Questions

Can the blood group of baby calculator predict the exact blood group?
No, the calculator shows possible blood groups based on genetic inheritance rules. The actual blood group of your baby can only be determined through a blood test.
Does the Rh factor affect the blood group calculation?
No, this calculator focuses on the ABO blood group system. The Rh factor (positive or negative) is not included in these calculations.
Can a baby inherit a blood group that neither parent has?
Yes, if both parents have different blood groups (e.g., one has A and the other has B), their child could inherit AB blood type, which neither parent has.
Is it possible for a baby to have a different blood group than both parents?
Yes, if both parents have different blood groups (e.g., A and B), their child could have AB blood type, which is different from both parents.
How accurate is the blood group of baby calculator?
The calculator is based on standard genetic inheritance rules and provides accurate predictions of possible blood groups. However, actual blood types can vary due to genetic mutations.