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It often happens that, having learned the blood type of their child, parents are at a loss. The mother is nervous: how did it happen that I have the third group, my husband has the first, and our daughter has the fourth? Reflections begin on the topic: what if the child was replaced in the maternity hospital, but how is this possible if the child looks like dad and mom, and the blood types of children and parents do not match? It turns out that such cases are possible.

Story

From a historical point of view, people only learned about the existence of groups at the beginning of the 20th century thanks to the Austrian scientist Karl Landsteiner. He proved that if the blood of two people mixes, there are two scenarios for the development of events: the erythrocytes of these people stick together or do not stick together. This allowed the scientist to conclude that everyone has different blood, and talk about the compatibility or incompatibility of groups.

Karl Landsteiner helped doctors a lot with his discovery. Now it was only necessary to determine the compatibility of the donor and the patient and avoid tragic outcomes, especially when saving children, because sometimes the child's blood type does not match the parents, and the latter cannot always become donors for their child. After 20 years, scientists learned that the factor of inheritance plays an important role in getting a person of one or another blood type, which depends on the laws of genetics, which work here strictly according to certain rules. The fact is that any inherited trait is determined by the genes of the mother and father, and a different blood type in parents and a child is the result of the interaction of these genes. The blood of the child may be the same as that of the mother or father, or even different.

How are the groups different?

Karl Landsteiner divided erythrocytes into two categories depending on their composition (the presence of antigens in them). The first category contains antigens A, the second - antigens B. In addition, a separate group of erythrocytes that does not have antigens in its composition was defined as "0". A little later, the followers of the teachings of Karl Landsteiner discovered group 4, which contained antigens A and B.

Four groups

And to this day, according to the generally accepted standard classification, there are four groups according to the ABO system (“a, b, zero”). The first is 0, the second is A; III group B, fourth, respectively, AB. A and B are dominant genes, and 0 is recessive, which does not manifest itself in any way, and it is not possible to determine which of the people has this hidden gene. But if this gene combines with its own kind, then it can form the first group (00). In addition to the group, the Rh factor of the parents is directly involved in the formation of the child's blood. The blood type of children and parents is certainly interconnected, and the blood does not change over the course of a person's life.

"Plan"? It's possible!

Today you can recognize the group of an unborn baby based on the elementary laws of genetics. Each of us has two group genes, while the child inherits one gene from the mother and father.

From the inheritance table, you can see how the blood group of children and parents correlates, and you can always independently determine the group of the future baby.

Group Inheritance Table

So, if the mother has the first group, then if the father has a similar situation, the child is guaranteed to inherit the first group. If dad is a carrier of the fourth group, then (with mom's first) the baby can equally have both ... the second and third groups. In this case, if the father has the second and third groups with genes AA and BB, respectively, the child will have the second (A0) and third (B0) groups, respectively.

The blood type of children and parents often do not match. If the mother's blood is of the second group with A0 genes, then if the father has the first group in the veins of the child, with a probability of 50%, blood of either group I or group II (with A0 genes) will flow. The second group of dads with AO genes will provide the child with 25% of the possible presence of group I (the probability that the child of the second group will be 75%, respectively). At the same time, if the parents have a 3rd blood type, the child will not succeed in any way. If the father is a carrier of the fourth group, everything is much more complicated and incomprehensible here. The probability of having such a couple (mom - the second group, dad - the fourth) of a child even with the third group is 25%, so sometimes there is a misunderstanding why the child has the third group, and the parents have the second and fourth.

Now consider the question, what is the blood type of the child, if the parents have the 3rd? If the mother and father have a third group with B0 genes, then the probability of a child having the first group with genes 00 is 25%, the third group B0 is 50%, and finally the third BB is 25%.

If the mother has the third group with BB genes, then if the father has blood group III with BB genes, the child will 100% inherit the third blood group with B0 genes. And if, with the same blood of the father's mother, the blood of the third group has the B0 genes, the child inherits the third group with the B0 or ​​BB genes with a probability of 50%. That is, when the parents have the 3rd group, the child cannot have the 2nd group.

If parents are carriers of the rarest group - the fourth, then the child can become a carrier of any group except the first.

If both parents are carriers of the same blood groups with the same genes (AA or BB), then, respectively, the child will have the same blood group with the same genes.

According to the group inheritance table, it is possible to determine the characteristics of the most important body fluid in a child. child by parents most likely? This will help analyzes and advice from doctors. By the way, the reverse is also possible here: if you know your group, you can determine the possible variants of the blood group of your parents.

Disease Prevention

Modern advances in medicine will tell you how to determine the blood type of a child by parents, but not only that. Diagnostic systems allow you to determine possible fetal malformations, and there is no point in talking about the importance of this information once again.

Donor for a child? Who can't be

The blood type of children and parents can match, and parents will be ideal blood donors for their child. If necessary, mom or dad can save their child. Or vice versa. It is only necessary to remember that there is a certain category of persons who cannot become donors. These are the people:

Also, people with somatic diseases are not eligible to be donors:

• diseases of the central nervous system,
• drug and alcohol addicts,
• persons with cardiovascular diseases,
• people with respiratory diseases and other diseases of the sense organs.

Rh factor

Now it’s clear how a child’s blood group is formed from their parents - the table clearly shows us all the possible options. But we should not forget that another characteristic of blood is the Rh factor, which in a person can be either positive or negative and is determined by the presence of certain proteins in the blood.

People whose red cells have the D antigen are Rh-positive. This property is almost 85% of Europeans and 90% of blacks and Asians. In the absence of antigen D in the blood, a person acquires the status of an individual with a Rh-negative factor, such people are a minority.

In the presence of a negative Rh mother and father, the child is born only with a negative Rh factor. If mom or dad is Rh positive, the baby can have any Rh. Contrary to popular belief, during pregnancy there is no complete incompatibility for the Rh factor. It is desirable that the rhesus of the father and mother are positive. A risk factor can be when the mother has a negative Rh factor, the father has a positive one, and the child inherits the father's Rh factor. The mother's body will start a "war" against the child's blood by producing antibodies. But even this can be dealt with by following the advice of doctors.

Blood type incompatibility

It will manifest itself if the woman has the first blood group (0), and the man has the fourth, second, third. If a woman is a carrier of the second blood type, then there is a risk if the man has a third or fourth. The third blood type of a woman "does not like" the second and fourth male groups.

Planning the sex of the child by blood types

Not only is the blood type inherited from the child's parents. The table below demonstrates the possibility of planning the sex of the unborn child, depending on the characteristics of the blood of the parents.

If the mother has the first group, and the father is a carrier of the first or third, then the child has a high probability of being born a girl, in other cases, a woman is more likely to give birth to a boy. To give birth to a girl, a mother who has the second group must choose a partner with the second or fourth group, and if the mother has a third group, then the girl will be born more likely from contact with a male carrier of the first group. Suppose a pregnant woman is a carrier of the fourth group. If there is a desire to give birth to a girl, the father of the child must be a carrier of the blood of the second group. This technique is not a 100% guarantee. Therefore, it is necessary to take into account the error when using it.

Pregnancy is a time of joyful expectations and anticipation. Parents make plans for an heir, choose a name. But first, the future father and mother want to know the child's gender, hair color, eye tone, and how the child's blood type is inherited from the parents.

What are the blood types?

The Austrian biologist and botanist Gregor Mendel is considered the founder of the study of genes. His research concerned the transmission of maternal and paternal genes to the child, as a result of which he came to the conclusion about certain signs of inheritance. These conclusions he formulated into laws. Mendel found that the heir must have one maternal gene, and the second paternal. Moreover, the inherited trait can be dominant (will appear) or recessive (will not appear). Mendel found that genes A and B are dominant, and gene 0 is recessive.

A blood group is a complex of red blood cells with a certain set of antigens. They are characterized by special organic substances having a carbonyl and hydroxyl group (carbohydrates) and high-molecular organic substances connected by a peptide bond (proteins) located in the shell of red blood cells.

According to the totality of the properties of red blood cells, people are distinguished by belonging to any blood group. It is personal for everyone, it is given from birth and does not change anymore. Blood is divided into 4 groups according to the AB0 system and into two groups according to the Rh factor system.

The first blood group is I (0). A characteristic feature of this group is the absence of substances that the body considers as foreign or dangerous. It is not easy for people with such a group to find a donor, since the first group is compatible with the same group. But it is universal for everyone else.

II (A) - the second blood group. The erythrocytes of this group contain an enzyme that transfers saccharide residues (A) and agglutinin beta. People with such a group are recipients for groups 0 and A.

III (B) - the third group. It is characterized by the presence of alpha antibodies and B antigens. People with such blood can act as a donor for groups III and IV.

IV (AB) - the fourth. This group does not contain antibodies. For people with such a group, any of the groups will be suitable for transfusion.

Of course, many factors are taken into account when transfusing blood, but the group remains one of the main ones.

Rh system: what Rh will the child take?

The Rh factor is an indicator of the presence or absence of a substance considered as foreign (protein) on the plane of erythrocytes. Rhesus is important in the formation of a pathological condition in a newborn - the breakdown of red blood cells ().

Rhesus, like the group, is congenital and does not change. It is taken into account in two situations:

• in preparation for various medical operations, donation;
• during pregnancy with placental exposure. If the expectant mother has a negative Rh factor, and the father, on the contrary, has a plus, during pregnancy the woman is under special control for spontaneous abortion. In Rh-conflict, the mother's body rejects the fetus with Rh-positive blood, as it considers it foreign.

How does blood type affect health?

Various studies have made it possible to determine the relationship between blood type and susceptibility to certain diseases:

• the threat of the appearance of a slowly progressive chronic neurological disease Parkinson's disease in the owners of the third group is higher than in the rest;
• people with all blood groups except the first are predisposed to heart disease.
• the owners of the third group are less likely to get plague.
• stomach ulcers are much more common in owners of the first blood group.

Experts have compiled special diets based on blood type, which contribute to the fastest recovery.

How exactly is a blood type inherited from a child's parents?

If the parents have the same blood type, then it is not at all necessary that the child will have just such a set of red blood cells. This is due to a recessive gene (O).

If the mother has the first blood group (I) and the father (I), then the probability for the child to be born with the first blood group is 100%.

Both parents (II) second group: child's blood (II) - 94%, (I) - 6%;

Both parents (III) third group: child group (III) - 94%, (I) - 6%;

Parents with the fourth group (IV): the child's group (IV) - 50%, (III) - 25%, (II) - 25%.

What blood type the child will have in the case of different blood types of father and mother can be clearly seen in the table:

The inheritance system of the Rh factor looks like this:

• if a negative Rh is inherent in both parents, then the child will have exactly the same;
• if, on the contrary, it is positive for both parents, then the probability of a positive Rh in a child is 94%, and this suggests that Rh-positive parents may well have an Rh-negative child;
• if parents have different Rh, then 75% of children inherit a positive Rh.

It is important to remember that calculations using various tables, schemes are only an assumption, the exact blood type and Rh factor are determined by a special laboratory analysis.

Compatibility of blood types of future mothers and fathers

One of the first tests that a pregnant woman takes is the blood type and Rh factor. The resistance of the Rh factors of the parents is fully reflected in the health of the baby, since there is a possibility that a conflict situation will arise.

This is necessary to know in order to smooth out the humoral response of an Rh-negative mother to the antigens of an Rh-positive fetus. In the event that the baby inherited a positive Rh from the father, and the mother is Rh-negative, this can lead to hemolytic diseases of the heir.

The risks for a baby with a Rh conflict increase with each new physiological process (pregnancy), even if it did not end in childbirth (abortion, ectopic pregnancy).

Many parents are interested in the question of what blood type a child will be born with. After all, many believe that a child inherits the blood type of mom or dad. But how are things really, and is it possible to calculate the child's blood type based on the blood parameters of the parents? This is what will be discussed in this article, where we will try to tell in as much detail as possible about the features of the formation of a blood group and the combination of blood groups.

A bit of history

Back in the early 20th century, scientists proved that there are only 4 blood types. A little later, Karl Landsteiner, conducting experiments, found out that when the blood serum of one person is mixed with the red blood cells of another person, a kind of gluing occurs - the red blood cells stick together and clots form. But in some cases this does not happen.

Landsteiner also found special substances in red blood cells, which he divided into two categories B and A. He also identified a third group, which included cells that did not contain such substances. Some time later, Landsteiner's students discovered erythrocytes that simultaneously contained A- and B-type markers.

Thanks to these studies, it was possible to derive a certain ABO system in which you can see the division of blood into groups. It is AVO that is used in our time.

1. I (0) - in this blood group there are no antigens A and B.
2. II (A) - this group is established in the presence of antigen A.
3. III (AB) - the presence of B antigens.
4. IV(AB) - the presence of antigens A and B.

With the help of this discovery, it was possible to find out exactly which blood types are compatible. It also made it possible to avoid disastrous results in blood transfusion, which arose due to the incompatibility of the blood of the donor and the sick person. Until that time, transfusions were also carried out, but most of the cases ended in tragedy. Therefore, the safety and effectiveness of transfusion could only be discussed by the middle of the 20th century.

In the future, geneticists came to grips with the study of blood, who were able to reliably find out that a child inherits a blood group according to the same principle as other signs.

Blood group of the child and parents: the principle of inheritance

After fruitful work on the study of blood and the principles of its inheritance, Mendel's law appeared in all biology textbooks, which reads as follows:

1. If parents have the first blood group, then they will have children in the blood of which there will be no A- and B-type antigens.
2. Spouses with the first and second group will produce offspring with the corresponding blood types.
3. Parents with the first and third groups will also have children with the corresponding blood types.
4. In people with the fourth blood group, children can be born with groups II, III and IV.
5. If parents have II and III groups, then their child can be born with any group.

Rh factor of the child: signs of inheritance

Quite often, you can find a lot of questions on the network about how a child inherits not only a blood group, but also the Rh factor. And often there are discussions of rather sensitive topics, for example, the father’s doubts that it was from him that the baby was conceived. This is especially common in situations where the parents have a negative Rh factor, and a baby with a positive blood group is born. In fact, there is nothing strange in this, and there is a quite simple explanation for such a sensitive issue. To understand the problem, you just need to study a little the question of what the blood type depends on.

The Rh factor in the blood is a lipoprotein. It is located on the membranes of red blood cells. Moreover, 85% of people on the entire planet have it, and it is they who are considered the owners of the Rh-positive factor. If the lipoprotein is absent, then this is called Rh-negative blood. These indicators in modern medicine are denoted by the Latin letters Rh, positive with a plus sign, and negative with a minus sign. To investigate the Rh factor, as a rule, you need to look at one pair of genes.

A positive Rh factor is commonly referred to as Dd or DD, it is a dominant trait. The negative factor is denoted - dd, and it is recessive. Therefore, in the union of people with a heterozygous presence of Rh (Dd), in 75% of cases, children with a positive Rh are born, and only in the remaining 25% of cases with a negative one. Therefore, we can conclude that the parents have: Dd x Dd. Children are born: DD, Dd, dd. Heterozygosity can occur as a result of the birth of an Rh-conflict child in an Rh-negative mother, and this phenomenon can also be preserved in the genes for many generations.

Inheritance of blood in a child

For many centuries, parents only had to guess how their baby would be born. In our time, we can slightly lift the veil of secrecy by looking into the "beautiful far away." This became possible thanks to ultrasound, which allows not only to find out the sex of the baby, but also some features of its physiology and anatomy.

Geneticists have learned to predict the possible color of hair and eyes, they can determine the presence of malformations in an infant in the early stages. It became clear what type of blood the baby will have. To better understand this and learn how to determine the blood type of a child, we suggest that you familiarize yourself with the table. Table of blood groups of parents and children:

Many parents also want to know how to calculate the Rh factor of the future baby. Another table will help with this. It is worth saying right away that the table will help you in the question of how to find out the baby's blood type. But sometimes children can be born with "their own blood type."

Many experts confidently state that if the father's blood type is higher than the mother's, then the baby will inherit not only the parental character (as grandmothers assure), but also health, the baby will be born strong and healthy.

It is also worth mentioning that conflicts due to incompatibility in the blood type of parents happen quite often, but they are not as dangerous as with incompatibility of Rh factors. Therefore, timely examinations are a guarantee that the born baby will be healthy. Science does not stand still, and now parents can learn about possible problems with the baby in a timely manner, and it has also become possible to prevent infertility and miscarriage. Indeed, today doctors, knowing that the mother has a negative Rh factor, can prevent the Rh conflict between the fetus and mother by introducing a special drug into the body - anti-Rhesus immunoglobulin. The study of blood and how it is inherited has saved hundreds of lives, not only for children, but also for mothers.

The blood type of children and parents can be different. It is impossible to make an accurate calculation using tables. The only option that will help you to know for sure the blood type of a child born into the world is a laboratory analysis.

The membrane of red blood cells contains a different amount of proteins, as well as carbohydrates, which are referred to as antigens. It is from their presence that the characteristics of the blood will depend. The most numerous is blood type 1 with a positive Rh factor.

Attention! The Rh factor is an indicator of the antigen that is contained on the surface of red blood cells.

Initially, the 1st positive group was designated as the letter C, then it was decided to prescribe 0, that is, thus, it was indicated that there were no antigens in the blood. On the contrary, the presence of the H antigen can be found on the surfaces of erythrocytes, as well as in other tissues of the body. A positive Rh is assigned to this blood group due to the confirmation of the presence of antigen D in the owners.

It should be noted that the blood retains its original characteristics (group and Rhesus) throughout life. The 1st positive group can be inherited by the child either from one or both parents. Only if the parents do not have the 4th blood group. It should be noted that the first positive can be used as a universal donor blood for the transfusion procedure. Group incompatibility will be absent if the Rh is “+”. If a person is injected with blood with a negative Rh, then as a result, red cells, that is, erythrocytes, will stick together, with a subsequent deterioration in the person's condition.

How can the Rh factor affect?

One of the most important characteristics of blood is the Rh factor. As already mentioned, this is an indicator of the presence of an antigen on the surface of red blood cells. Simply put, this is an indicator of protein on the surface of red blood cells. Most people are characterized by the presence of antigens and, accordingly, have a positive Rh factor, the rest of the people are distinguished by their absence, therefore they have a negative Rh factor.

The Rh factor is very important in two cases:

1. During the period of bearing a child, it can threaten life from incompatible rhesus.
2. If surgery is being performed, which may involve a blood transfusion.

All other moments associated with Rhesus a priori do not affect the state of the body, therefore, they do not matter.

Pregnancy and blood compatibility

It is very important to plan pregnancy, because blood compatibility during this period occupies a special place in the birth of a healthy baby. When both parents have a negative or positive Rh, the child will accept the identical one as his parents, therefore, there will be no problems. The situation is similar with the acquisition of a blood group from parents. As studies have shown, babies often acquire the maternal blood type. Based on this, if the mother is carrier I positive, then there is a 90% chance that the baby will also be a carrier of this blood type, regardless of what blood type the father has.

Can there be an Rhesus conflict?

During pregnancy, the occurrence of such a problem as the Rhesus conflict is not excluded. It does not mean a combination of parents' rhesus: for example, the mother's is positive, and the father's is negative. The child in this case can acquire both negative and positive Rh. If the child takes maternal blood, then the pregnancy promises to be without problems.

Attention! A complication of pregnancy occurs when the child has a positive, and the mother has a negative Rh factor. Then there is a conflict between the blood of the fetus and the mother, which can lead to various serious complications during pregnancy.

Rhesus incompatibility has dangerous consequences. This is explained by the fact that antibodies produced by the mother's body can destroy the fetus. In half of the cases, the baby acquires a positive Rh, but if the mother is negative, then there is a risk of miscarriage or intrauterine death of the fetus.

How compatible are blood types?

Until recently, experts believed that plasma transfusion occurs without consequences in any quantities. The compatibility of the first positive with other groups was excellent. However, after a series of studies, it turned out that plasma contains agglutinins, and with frequent transfusions, the likelihood of a negative impact on human health increases. Based on this, it was decided to dilute the plasma of group I with the plasma of the recipient, and only after that proceed with the transfusion procedure in order to avoid possible complications.

Possible diseases

The owners of the first positive blood group are the least affected by serious diseases, so they live longer than the rest. However, they may be predisposed to stomach ulcers due to their high acidity. There is a high probability of an inflammatory process of the gallbladder and liver. Women may be at risk for skin tumors. But, despite the above ailments, the carriers of the first group are very resistant to nervousness, therefore they suffer the least from mental disorders and keep the youthfulness of the brain much longer.

Reference! Among carriersI blood group with a positive Rh factor is extremely rare for people suffering from schizophrenia.

Based on medical research, it has been found that people with the first blood group suffer from typical diseases:

1. Pathological lesions of the joints. Arthrosis and arthritis.
2. Location to permanent seasonal SARS.
3. Respiratory ailments.
4. Thyroid dysfunction.
5. Hypertonic disease.
6. Ulcerative lesions of the gastrointestinal tract.
7. Hemophilia among men.

Information about diseases depending on the blood type is contained in the video.

Video - Blood type and diseases

1. Poor blood clotting - such a statement is presented by hematologists. Therefore, it is very important to be careful when taking drugs that contain aspirin, which helps thin the blood.
2. There may be problems with the intestinal microflora, therefore, as a preventive measure, it is best to take probiotics.
3. Herbal decoctions (mint and rosehip) have a positive effect on the body. But, aloe and burdock root are recommended not to be used.

Proper nutrition

The health of each person is primarily affected by the diet. After all, the food of the daily diet should contain a set of products that positively affect the metabolism and the digestive system as a whole.

It was found that carriers of positive I tend to be overweight. An increase in extra pounds occurs due to a violation of proper healthy nutrition. From time immemorial, people with I positive have been hunters, so their diet should be mostly natural proteins. Such a statement was recognized even by official medicine. Therefore, it was installed list of necessary products for people withI blood group.

It is necessary to adhere to the peculiarities of dietary nutrition, since people with the first blood group are prone to diabetes.

Note! In general, for normal health, owners of all blood types are recommended to adhere to proper nutrition and lead a healthy lifestyle (with mandatory sports), but for people with a blood groupІ positive Rh factor, follows, builds his diet on foods high in protein.

It is known that foods rich in protein can, in small quantities, quickly relieve hunger and fully saturate the body. In addition, they support the normal metabolic process. Basically, protein-containing foods are all types of meat, especially dark. Particular attention should be paid to the liver, as an offal for cooking, which contains a sufficient amount of protein.

To avoid problems with the performance of the thyroid gland, you should regularly eat seafood that contains the required amount of iodine.

Attention! It must be recalled that it is the thyroid gland that is most often vulnerable in people with a blood typeІ positive Rh.

When planning a diet, it is necessary to take into account the blood type, therefore, at the first positive, it is recommended to use goji berries, more details can be found here.

Video - Diet: 1 positive blood type

Can blood affect a person's character?

According to statistical data, it was found that the owners of the first positive have a persistent character, are confident in themselves, are able to set goals and go towards them without going astray. A general characteristic shows that those with blood type I have strong willpower, so there are a lot of leaders among them.

Scientists have added increased emotionality, excessive jealousy and an increased level of self-preservation to the psychological portrait of such people. Self-confidence, backed up by leadership qualities, helps to calculate actions and steps in advance, determining in parallel one's own benefit.

Women with blood group I constantly analyze their activities and categorically do not perceive criticism in their direction. Most often they occupy high positions. A professional psychologist will tell you about how a blood type affects a person’s character and determines fate in a video. study on our website.

Video - How blood type affects our destiny and character

To understand how a child's blood type is inherited from parents, a table, as well as minimal knowledge of the laws of genetics, will help future mom and dad. And then they will not have to wonder why their blood characteristics differ from those of the baby.

What is a blood group? What are there?

The blood type belongs to those signs that a person receives from his father and mother at conception. This is a constant indicator, you have to live with it all your life.

At the beginning of the last century, a classification of blood groups was drawn up. The whole system is called ABO. Belonging to a particular group is fixed by antigens. These are special structures located on the surface of red blood cells - erythrocytes. Researcher Karl Landsteiner divided these substances into 2 groups - A and B. If a person does not have either antigen A or B, then these cells are called 0. A little later, cells were also discovered whose membranes contain both antigen A and B.

So there are 4 groups:

• I (0) - there is neither antigen A nor B on the surface;
• II(A) - there is only antigen A;
• III(B) - there is only antigen B;
• IV (AB) - a combination is determined, that is, both antigen A and B.

Blood transfusion rules

This division is important in blood transfusion. The transfusion procedure began to be carried out by doctors a very long time ago, but they could not guarantee a positive result, because they did not understand what success depended on. During scientific research, it was noticed that when some blood groups are combined, clots appear, the blood seems to stick together, and in other cases this does not happen.

Based on this, the following rules were identified:

• it is forbidden for a patient with blood group A to transfuse blood of group B;
• a patient with 4 (AB) blood group can enter any blood;
• a person with blood type 0 will only need similar blood. After all, if there is no antigen A or B in the body, then when such blood is transfused, the body will not accept it, when mixed, the so-called agglutination reaction will occur, that is, gluing of red blood cells. To avoid these unfortunate consequences, it is better for parents to find out their blood type in advance, and for the child to determine it at birth.