What if the blood group baby is different from the mother?

Did you know that the blood type of your baby can be different than yours? That is because the blood group is determined by the father and by the mother. In principle, it often happens that the baby's blood group is different. In the placenta, both blood groups are neatly separated. Sometimes it can have consequences if your blood groups differ in a certain way. Blood group babyYou can read all about it here.

Determine blood group baby

The blood type of your baby is determined by the genes of both parents, not just those of the mother. That is why the blood type of your baby may be different from yours. The blood groups that exist are A, B, AB and O. In addition, there is always a resus factor. The rhesus factor is a protein that is linked to the blood. Most people (85.25%) have this factor in the blood, the other people do not. So you can be resuspositive or rhesus negative.

The blood group is thus determined by both parents. If you both have blood group O, then your baby will get that too. If the parents do not have the same blood group, your baby's blood type may change. Blood group A or B are always dominant and O is recessive. Blood group O is therefore more common.

Blood groups combination

If you both have blood type A, the blood group of your baby becomes A or O. Does the father A and the mother B have your baby blood group A, B, AB or O. And so there are several combinations possible, see the following blood group scheme:

MotherFatherBaby
aaA or O
BaA, B, AB or O
ABaA, B, AB
ABABA, B, AB
BBB or O
ABBA, B, AB
OOO
aOA or O
BOB or O
ABOA or B


O + is the most prevalent in the Netherlands (around 40%). Followed by A + (35%). The other blood groups are therefore rarer, of which AB is the most rare. This blood group occurs in only 0.5% of the Dutch population.

Blood groups that do not go together

In itself it is not bad if the blood group of the baby is different from the mother. The blood groups are neatly separated by the placenta. Only during labor can the mother come into contact with the baby's blood group.

If the mother is rhesus negative and the baby resuspositively, the mother will produce antibody D against the baby's blood. This happens only during or after delivery. This is not dangerous for the baby that was born at that time. But once the mother has made antibodies, they remain in the blood.

At the next pregnancy these antibodies can start playing if the next baby has another blood group!

If the next baby has a different blood group than the mother and the mother has antibodies in the blood, this can have consequences for the baby. Some antibodies may break your baby's blood, resulting in anemia in your child.

During your pregnancy, you will soon be examined if you have antibodies in your blood against the blood group of your baby. If this is the case, then you will be closely monitored during pregnancy. It is not necessary to terminate the pregnancy.

Blood group baby: Where can I find the blood type of my child?

You can find the blood group of your baby via the GP. You may be sent to the hospital so that they can determine the blood group in the lab.

There are also home tests for determining the blood type of baby, but for real certainty you can go to the specialist.

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