Odnoyaytsevye and raznoyaytsevye twins - what is the difference
The birth of the long-awaited child in the family is always a joy. And if two or more babies appear at once, happiness increases directly proportional to their number.
Let's talk about the factors that contribute to the development of multiple pregnancies, as well as the differences between identical and non-identical twins.
Who is considered to be twins?
Twins commonly refer to children who were born as a result of a single pregnancy. In this case, they can be either one or different sex. Despite the fact that there are two concepts in the people: twins and twins, medicine recognizes only the first name. But it divides it into two types: identical and dissimilar.
Future parents need to know about some of the nuances of multiple pregnancies.
First, the children in any case will be cramped in the womb. Therefore, it often happens that one of them lacks placental nutrition. In addition, such infants are usually born with insufficient weight and may lag behind in physical development from their peers. They later begin to hold their head, sit, crawl, walk and so on.
Secondly, the birth of twins is not only a double joy, but an increase in the number of worries. After all, both kids need to feed the same, change clothes, bathe and so on.
As for the pluses, they can be attributed to the early social development of such children. They learn to communicate with each other before their peers. By the age of 10 months they are developing friendly relations, they are able to experience jealousy if their parents are busy with their brother or sister. Twins are already up to a year old can be upset when they do not see each other and start to get bored.
If the fertilized cell is divided into several parts, each of which has continued to develop separately, each of the embryos will receive the same set of genes. This is the way the conception of identical (monozygotic) twins is conceived. Such babies usually develop at about the same pace, they are always of the same sex and are very similar in appearance. Although there are cases when children have mirror features. For example, one of them may have a mole on the right cheek, and the second on the left and so on. In addition to all this, identical twins usually have similar temperaments and characters, have the same interests.
For a good example of how identical twins look, the photo below is provided.
For normal pregnancy is not typical of the division of the egg into several parts, so the cases of the birth of monozygotic twins are not so often.
It is customary to call them "twins". Why are born differently twins? The reasons for the multiple pregnancy of this type are that simultaneous fertilization of several eggs takes place. At the same time, each of the embryos develops independently, and future children can be of one and the same sex. In order to have an understanding of how the fake twins look, consider the photo below, it will serve as an example.
As you can see, the similarities between them are the same as those of ordinary brothers and sisters.
The different twin twins also differ in temperament, interests, and character traits.
As the age of a woman increases, the likelihood of multiple pregnancy increases. Although the birth of heterozygous twins is primarily associated with a genetic predisposition.
Gemini is identical and differentiated: what is the difference
Summarizing the above, and supplementing it with new information, it is possible to single out the general differences between identical and dissimilar twins.
- The method of fertilization, which occurs as a result of the division of one or the simultaneous fertilization of several oocytes.
- In the womb of the mother, the rabbits have their own placenta and amniotic fluid. At odnoyaytsevyh they can be as different, and one for two.
- Appearance. Identical twins are often similar to each other as two drops of water, and in some cases even parents can not discern them. Raznoyaytsevye have a different appearance, and similarities are possible only as between ordinary siblings and sisters. They can differ even hair color, face shape, blood type and its Rh factor.
- Character. Identical twins are usually similar even in the manner of behavior and preferences, while the raznoyaytsy develop quite differently and can be complete opposites to each other.
What contributes to the birth of twins?
Why is it that in one family there can be even a few pairs of twins, and in another, babies are born only one by one? There are several predisposing factors, due to which odnoyaytsevye and raznoyaytsevye twin are born. In each case, they are different, and therefore we will consider them separately from each other.
The birth of identical twins contributes:
- presence of oxygen deficiency;
- the effect of toxic factors on the pregnant;
- the woman's age is more than 30 years.
Raznoyaytsevye twins can be born in the presence of one or more factors:
- the use of hormonal contraceptives for a long period of time or their cancellation;
- hereditary predisposition;
- abnormalities of the uterus;
- stimulation of ovulation.
In addition, there is a relationship between multiple pregnancies and race. As statistics show, the African chances of getting pregnant with twins are much higher than those of Asian women.
Signs of multiple pregnancies
How to determine that in the family will soon be born identical or dissimilar twins? The most accurate way is, of course, the conduct of ultrasound (ultrasound). In addition, the multiple pregnancy can be judged by too rapid increase in the uterus and mismatch in its size of the term. Such information can be obtained from a gynecologist, who necessarily pays attention to this during a mandatory examination.
Another point - the presence of a large belly already in the early stages. Not always, but in many cases it also indicates that several babies will appear at the same time.