Identical and fraternal twins — what is the difference
The long-awaited birth of the child in the family is always a joy. But if you have two or more kids — happiness increases in direct proportion to their number.
Talk about the factors that contribute to the development of multiple pregnancy, as well as the differences between identical and fraternal twins.
Who is considered the twins?
The twins called the children who were born as a result of one pregnancy. However, they can be both one and different sex. Despite the fact that the people there are two concepts: the twins and the twins, medicine only recognizes the first name. But divides it into two types: identical and fraternal.
Expectant parents need to know about some of the nuances of multiple pregnancy.
First, children in any case will be cramped in the womb. So often it happens that one of them is not enough the placental supply. In addition, such babies are usually born underweight and may lag in physical development from their peers. They are a little later begin to hold her head, sit, crawl, walk and so on.
Second, the birth of twins is not only double pleasure, but also an increase in the number of concerns. Because both babies have the same feeding, disguise, bathing and so on.
As for the pros, these include the early social development of such children. They early learn to communicate with each other. Already by 10 months they develop friendships, they are able to experience jealousy, if the parents busy with their brother or sister. The twins have until one year of age can get upset when you don't see each other and bored.
If the fertilized cell split into several parts each of which continued to evolve separately each of the nuclei will receive the same set of genes. In this way there is a conception identical (monozygotic) twins. Such babies usually develop at about the same pace, they are always the same sex and very similar in appearance. Although there are cases where children have mirrored features. For example one of them could be a mole on the right cheek and the second on the left, and so on. In addition, identical twins usually have similar temperaments and personalities, have the same interests.
For a good example of how identical twins are provided below.
For normal pregnancy is characterized by the division of the egg into several parts, so the cases of the birth of MZ twins occur less often.
Them people are called "twins". Why are born fraternal twins? Causes of multiple pregnancy of this type is that there is a simultaneous fertilization of several eggs. Each embryo develops independently, and future children can be both one and different sex. To have an understanding of how to look like fraternal twins, the photo below will consider, it will serve as an example.
As you can see, the similarities between them are the same as normal brothers and sisters.
Fraternal twins differ in temperament, interests, traits.
With increasing age women the risk of multiple pregnancies increases. Although the birth of fraternal twins in the first place due to genetic predisposition.
Twins identical and fraternal: what's the difference
Summarizing the above and adding this new information, we can identify General differences between identical and fraternal twins.
- Method of fertilization, which is the result of dividing one or simultaneous fertilization of several eggs.
- In the womb, fraternal twins each have a placenta and an amniotic bubble. Identical they can be different and one for two.
- Appearance. Identical twins are frequently similar to each other as two drops of water, and in some cases they can't even distinguish the parents. Fraternal have different appearance, and similarity is possible only as between ordinary brothers and sisters. They may differ even hair color, face shape, blood type and her RH factor.
- Character. Identical twins are usually similar even demeanor and preferences, while fraternal evolve quite differently and can be complete opposites to each other.
What contributes to the birth of the twins?
Why it so happens that in one family, maybe even a few pairs of twins, and other babies are born only one? There are several predisposing factors which are born identical and fraternal twins. In each case they differ, so we consider them separately from each other.
The birth of identical twins helps:
- the presence of oxygen deficiency
- the impact of toxic factors on pregnant
- a woman's age more than 30 years.
Fraternal twins can be born in the presence of one or more factors:
- hormonal contraceptives over a long period of time or to cancel them
- genetic predisposition
- anomalies of the uterus
- stimulation of ovulation.
In addition, there is a relationship between multiple pregnancies and racial identity. Statistics show that African women have the chances of getting pregnant with twins is much higher than the Asian women.
Signs of multiple pregnancy
How to determine what the family will soon be born identical or fraternal twins? The most accurate way is, of course, an ultrasound examination (sonography). In addition, a multiple pregnancy can be judged by the too rapid increase of the uterus and the inconsistency of its size deadline. Such information can be obtained from a gynecologist who definitely pays attention to it during the mandatory inspection.
Another point — the presence of a large belly already in the early stages. Not always, but in many cases, this also suggests that the light will appear at the same time a few kids.