Mom, who expects twins, is always interested in whether her children will look like two drops of water or just like a brother with a brother or as a brother and sister. Unequivocally, no doctor can say, but if it's enough to establish exactly what kind of twins mom wears, it will be possible to assume with a high probability what exactly the children will look like outwardly.
There are two types of twins, which in turn are divided into several subspecies:
- monozygotic twins;
- dizygotic twins.
Monozygotic twins are the embryos that have come about after the separation of one egg. Depending on the period of separation, monozygotic: bihorionic, biamnotic, daimniotic and dichoric are distinguished. As a rule, monozygotic twins belong to the same sex and are very similar to each other.
Dizygotic twins are fraternal twins. Such babies develop each in their pouch, and each feeds on its placenta. They can be either same-sex or heterosexual. And also can be completely different up to the color of the eyes and hair.
Types of monozygotic twins
Monochorionic diamial twins - this kind of twins is the most common for an identical twins. This twins are formed on 4-8 days after fertilization of the egg, but until the moment when the zygote is implanted. Monochorion means that this twins are fed from one placenta during pregnancy . This situation is much more dangerous than that version of twins, when each embryo has its own placenta. A stronger baby will suppress the development of his brother or sister, which is why such children are born with a difference in weight of up to 500 grams. Diammonial twins mean that each fetus develops and grows in its fetal sac, while the amniotic fluid from one does not get to the other. This type of twins is called - identical twins, they will be of the same sex and very similar to each other.
Monochorion biamnotic twins are the same as monochorionic diamial twins-the common placenta, but each in its sac.
Monochorion mono-amniotic twins - this kind of twins is one of the most dangerous. Separation occurs between 8 and 12 days from fertilization, at the time when the blastocyst is implanted in the endometrium. Both embryos are in the same amniotic sac and are fed from one placenta. Such twins originated from one fetal egg, and it is absolutely natural that they will have the same blood type, sex and chromosome set. Such children will be difficult to discern even their own parents.
The danger is that one child may become entangled in the umbilical cord of the second, and there may also be a variety of other abnormalities.
In the event that the separation of the egg occurs later than the 13th day from fertilization, complete separation is unlikely to occur. The light may appear Siamese twins, fused with any part of the body.
Complexities of multiple pregnancies
As a rule, multiple pregnancies proceed somewhat more complicated than singleton pregnancy . In this case, monochorionic twins, in
In any case, wearing two living men under the heart at once is a great privilege and honor for the mother. And a lot of absolutely healthy twins, who have already been born, give hope to every mother who is waiting for twins.