Do you know how the twins form? Many couples dream of having twin children, especially a couple. But this type of pregnancy is more complicated than the others, because it consumes more energy from the mother, births are usually premature and many other things. Learn a little more about this subject right now.


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The types of twins

In general, we can say that twins can be formed in two ways, this is because there are two types of twins: the univitelinos, better known as identical twins, who consequently are always of the same sex, and fraternal twins, which can be of different sexes and are not always similar. Here’s how each of these two types of twins is formed.

The identical twins

Identical twins are formed when an egg is fertilized by a sperm and divides into two complete cells. These cells have the same genome, making the twins identical. These changes take place between 1 and 14 days after fertilization.

When cell separation takes place over a period of more than 8 days, there is the possibility of Siamese twins, those who are born together and share some body structures.

The fraternal twins

Fraternal twins, also known as dizygotic, are those who are not identical and come from different eggs. In this case, the woman releases two or more eggs and each of them is fertilized by a sperm. The zygotes that form develop independent of each other, in different placentas, as if there were two different pregnancies.

Because of this, the genetic makeup also differs. Usually this type of pregnancy occurs when the couple undergoes treatments to have children. In some techniques used by doctors, in vitro fertilization , several eggs are fertilized and implanted in the uterus so that the chances of success are greater.

How does childbirth occur?

Generally, twin deliveries occur by high means, that is, by caesarean section. This is because it is more common for babies to be born premature and smaller, the pressure on the mother’s bones, muscles and joints is greater than when delivering a single baby.

The difference between giving birth to a twin is the number of placentas. When there are two placentas, one for each fetus, the pregnancy becomes less complicated. If there is only one placenta for the two fetuses, it becomes more complicated.

Ideally, both babies should be upside down, but this usually doesn’t happen, which is why a caesarean section is recommended. Often, the biggest complication in this type of delivery happens to the second baby. Sometimes he is not in a favorable position or the contractions are not enough to expel him.

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