How to increase the chance of having twins

Now is the era of two children, so many families are preparing for the second child, but many mothers think that since pregnancy means suffering, it is better to endure it all at once. Therefore, giving birth to two children at once can solve this problem, and there is no need to have a second child. To increase the chance of pregnancy by having twins, this still depends on the quality of the follicles and sperm. Everyone's chance of having twins is different.

The formation of twins

Boy-girl twins are twins of different sexes, that is, dizygotic twins. Only in this situation can boy-girl twins appear. There is a 50% chance of dizygotic twins becoming boy-girl twins.

Twins formed by the splitting of a single fertilized egg are called monozygotic twins. They are released from the same mature follicles, or mature follicles from both ovaries. In this case, there will be no twins, a male and a female. The characteristic of monozygotic twins is that the blood circulation of the two fetuses is connected through the placenta. Therefore, the blood type and gender of identical twins are exactly the same, and their faces are difficult to distinguish. Having twins is related to genes, race, drugs, etc.

The reason for the formation of twins is that two eggs are fertilized at the same time to form two fertilized eggs, which become dizygotic twins. They are implanted in the decidua layer of the uterine wall and develop into twins. This type of twins is a group of two fetuses each with a separate placenta, chorion and alanine membrane. The blood circulation between the two placentas is not connected. The two fetuses live in their own gestational sacs, and there is a septum between the two amniotic membranes composed of two sides of the amnion and two layers of chorion. The gender and blood type of dizygotic twins can be the same or different, and their appearance is the same as that of normal brothers and sisters.

The probability of twins

I believe many people know that the probability of having twin boys and girls is very small, but how small is it?

Boy-girl twins are twins of different sexes, that is, dizygotic twins. Boy-girl twins are only possible under such circumstances, and there is a 50% chance of dizygotic twins being boy-girl twins. The characteristic of monozygotic twins is that the blood circulation of the two fetuses is connected to each other through the placenta. Therefore, the blood type and gender of identical twins are exactly the same, and their faces are difficult to distinguish. Having twins is related to genes, race, drugs, etc.

The country in the world with the highest probability of giving birth to twins is 15/1000, while the probability in my country is about 5/1000, and the probability of giving birth to twin boys and girls is much smaller.

About the probability of having twins:

Twins are identical twins, while boy-girl twins are fraternal twins. In very rare cases, identical twins may be one boy and one girl, but in this case, both boys and girls usually have chromosomal or genetic abnormalities. From 1961 to 2000, at least four cases of identical twins of different sexes have been reported in the medical literature.

The so-called identical twins refer to the situation that during fertilization, a fertilized egg undergoes mitosis to become two embryos. They have the same gender and genes, and the probability is extremely low. Fraternal twins refer to the situation where two eggs are implanted in the female's uterine cavity during fertilization and fertilization occurs at the same time, forming two embryos. These two embryos have their own placenta and different genes. When one of their genes is xy and the other is xx, they are twins, a boy and a girl. When two embryos have the same genes, they are fraternal twins, which is also a very low probability.

The probability in our country is about 5/1000, and the probability of having twins is much smaller, with the probability of having twins being 25%.