What blood type will my child be?

What Blood Type Will Your Child Have?

Wondering what blood type your child might inherit? It’s a common question among expecting parents, and the answer lies in genetics. Your child’s blood type is determined by a combination of the blood types of both parents. Each parent carries two alleles (variants of the blood type gene), but only passes one down to their child.

There are four main blood types—A, B, AB, and O—and each person inherits one allele from their mother and one from their father. For example, if you have type A blood, your genotype could be either AA or AO. The same goes for type B. Type AB means you carry both A and B alleles, while type O means you carry two O alleles (OO).

Because each parent contributes one allele, there are 16 possible combinations when predicting a child’s blood type. Some outcomes are more likely than others. For instance, two parents with type O blood will almost certainly have a child with type O. But if one parent is type A and the other is type B, the child could end up with A, B, AB, or even O—depending on which alleles are passed down.

While it’s fun to speculate, the exact blood type can’t always be predicted with certainty without knowing the specific genotypes of each parent. Still, understanding the basics helps demystify how traits are inherited. Genetics plays a quiet but powerful role in shaping the unique characteristics of your little one, and blood type is just one piece of that puzzle.