Child Blood Type Calculator

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Last Updated on Mar 26, 2025

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Child Blood Type Calculator

Do you want to know your unborn baby’s blood group? Our blood type calculator can help you discover it!

A baby’s probable blood group is mainly determined by the mother’s and the father’s genes (1). While knowing the exact blood group of the unborn baby is not possible, this tool gives you a list of the blood types that baby is likely to have.Since most blood type calculators are based on theoretical principles and cannot conclusively determine a baby’s blood group, consult a professional to ensure accurate results. In some cases, this information may be crucial for preventing maternal-fetal Rh incompatibility and neonatal disorders.

Here’s our easy-to-use child blood type calculator. Simply select the mother’s and father’s blood types to find out the probable blood group of your future child.

Mother’s Blood Type

A+

B+

AB+

O+

A-

B-

AB-

O-

Father’s Blood Type

A+

B+

AB+

O+

A-

B-

AB-

O-

Your child can have any of the possible blood types mentioned below:

Possible Blood Type:

Possible RH Type:

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In This Article

Blood Type Determination

Blood groups were discovered in the 20th century when Karl Landsteiner observed that the red blood cells (RBCs) had specific substances (antigens) on their surfaces, which were later used to create blood types. The two important blood group classifications in humans are the ABO and the Rh systems. The ABO system has four major blood groups – A, B, AB, and O.

Blood type A has the antigen A, blood type B has the B antigen, AB has both antigens and O has no antigen on its surface (2). Each of these groups is either Rh positive (D) or Rh negative, which means there are eight major blood groups in all. Knowledge of both these systems is essential for medical reasons, especially blood transfusions and blood type-related conditions.

The ABO Blood Group System:

The gene, ABO, determines this blood group system. The four blood groups – A, B, AB, and O may develop when the child inherits one or more of the alleles – A, B, or O. The alleles A and B are considered codominant while O is considered to be the silent allele. Each parent gives one of their two ABO alleles to the child (3).

For instance –

Mother with AB blood type can either pass the A or B allele to the baby. Likewise, a father with O blood type can only pass O allele to the baby.
If both parents belong to the blood group O, the child will also belong to the O blood group.

Two A blood group parents can give their child either A or O blood group.

Two B blood group parents can give their child either B or O blood group.

One parent with A and another with B will give their child either A, B, AB or O groups.

One parent with A and another with AB will give their child either A, B or AB groups.

One parent with A and another with O will give their child either A or O blood group.

Rhesus (Rh) Blood Group System:

It is the second most popular and also one of the complex blood types discovered by Landsteiner and Weiner in 1940. The research with rhesus monkeys on human blood led to the Rh factor, which can be either positive (+) or negative (-). With this blood grouping system, eight blood types were formed.

The Rh positive (Rh+) genotype masks the Rh negative (Rh-) gene. So even if you have an Rh+ blood type, you could possess an Rh- gene. Also, when both parents have the Rh+ gene, it is possible for the child to have Rh- blood type(4).Sometimes, a baby can be Rh+ while the pregnant woman is Rh-, a phenomenon called Rh incompatibility. In such cases, the mother’s body may release antibodies to attack the baby’s developing red blood cells, leading to a serious condition known as Hemolytic Disease of the Fetus and Newborn (HDFN) (5). This condition can be prevented with blood testing during pregnancy. If the mother is Rh- and has not been sensitized, she is given Rh immunoglobulin (RhoGAM) to prevent her antibodies from attacking the baby’s Rh-positive red blood cells (6).

Parental Rh type	Child’s Rh type
+ and +	+ or –
+ and –	+ or –
– and –	–

While blood groups are 100% genetically inherited, the environmental influences determine which groups are passed on more frequently to the next generations. According to the American Red Cross, B(-), AB(-) and O(-) are the rarest blood types and each account for less than 5% of global population.

Have you tried the calculator yet? Let us know what you think.

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Disclaimer:

The child blood type calculator is based on theoretical principles. The information should not be used to make any conclusions about your family’s blood grouping. There is a chance that the blood type calculated here and the actual blood type of the baby are not the same. Therefore, we recommend that you check the baby’s blood type with a healthcare provider as well, instead of relying only on the calculator for determining blood type inheritance.

References

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