Parents try to find out the sex of the child before birth, especially when there is a 1 and a second is planned. The majority wants children of different sexes in the family. It has practical value - you need to pre-buy baby stuff to choose a name, to prepare older children to the appearance of the baby. You can determine the sex of the child's blood group of parents before conception.
The method
There is speculation that the group membership gems and Rh factor of parents not only affects the health of the baby, but also its floor. Scientists at different times tried to find a relationship, empirically probability table has been developed, according to which the child's sex can be determined. In her lines contain values for women, and the columns - for men, at their intersection, and is an answer to the burning question.
Sex on the blood group of the fetus in utero is determined. After conception, a fetus is formed by a unique set of genes is dependent on the blood group of parents.
How to calculate
To calculate the sex of the child by blood, it is necessary to know the parameters of the AB0 system. These mother and father are in the relevant columns of the table. To determine the role played not only the artist, but also the Rh factor. If the results of both methods converge, then the probability of birth in accordance with the most accurate calculations. When the figures are different - one will be a boy or a girl, you need to focus on the AB0 system.
For ease of computation have special calculators and programs. Introduce in their blood data parents expect and get the prospective heir to the floor.
Blood group
Determining the sex of the child blood group of parents conducted by AB0 system. Everyone should know their group identity as identify reliably the figure is difficult if required transfusion in emergency conditions. A mistake by the transfusion of incompatible gems can cost lives.
The following options for determining the group:
- Woman with I t. can conceive a boy by men from the II and group IV, and a daughter -. from a partner with I and III.
- Woman with Group II. may have daughter from the spouse with II and IV c, and son -. from the husband and I to III.
- Woman III c. will have only a daughter from a partner with I c., are the sons of other cases.
- Women with the group IV. often give birth to boys, the exception -. Union with a man II c, then a girl.
| Paul and the band | The man I | man II | man III | man IV |
| woman I | Girl | Boy | Girl | Boy |
| woman II | Boy | Girl | Boy | Girl |
| woman III | Girl | Boy | Boy | Boy |
| woman IV | Boy | Girl | Boy | Boy |
Rh factor
According to this method, if the future mom and dad the same Rh factor (positive or negative) - is worth waiting for the girl, if the Rh factor of one wife "+" and the other "-" - higher odds expect a son.
| Floor | Male Rh (+) | Man Rh (-) |
| Female Rh (+) | Daughter | Son |
| Woman Rh (-) | Son | Daughter |
The calculation is made by analogy with the definition of AB0 system.
the accuracy of the method
System ABO and Rh are proteins immobilized on the red blood cells - red blood cells. Genes encoding the synthesis of these peptides are located on chromosomes 1 and 9, and not on germ (X or Y). This suggests unreliability and unscientific this method. Blood on the floor affected indirectly.
Determining the sex of the child by blood group and wrongly because the method does not explain how one family can have children of different sexes, proteins on red blood cells are not subject to change. Matches results with this method - no more than a coincidence.
Role in shaping the sex of the child played only sex chromosomes. Who wait - daughter or son - to a greater extent depends on the man. Male germ cells contain the unlike sex chromosomes 2 - X and Y, and for women - the same name X and X. Child gets half of the genetic material from each parent, t. E. One of his sex chromosome is inherited from the father, and the other - the mother.
Calculate the sex of the fetus before its conception - it is impossible. But there are proven methods that give this information on the different stages of pregnancy:
- Ultrasound - to determine the sex, it is possible to have 13 weeks, the most accurate results can be obtained from 21 weeks of pregnancy. In Russia, according to the order of Ministry of Health of the Russian Federation № 572n, pregnant women supposed to pass ultrasound screening three times (10-14, 18-20 and 30-34 weeks), it is done with the aim of early detection of congenital abnormalities and anomalies can be determined and at the same time floor.
- DNA analysis of the blood of the mother - is already in the early stages in the pregnant woman's blood circulating fetal cells in small quantities, the task - to find traces of the Y-chromosome. If they are present, will be a boy. Test is accurate, errors can only be in multiple pregnancies. Blood is taken from a vein, an empty stomach.
- Chorionic villus sampling - invasive method performed by a physician, usually for the purpose of early diagnosis of genetic diseases. It is not safe (there is a risk of miscarriage, infection), so its use is limited. The main indications are the age of the mother (over 34 years), the presence of a child with a genetic disease and disease, which is associated with the inheritance of sex chromosomes (eg, hemophilia).
family planning centers, doctors say that the sex of the child - not the most important thing in his life. When a newborn is healthy and full of energy for the future growth and development of his sexual identity has no meaning.
