Upon receiving the news that pregnancy comes twice, many parents wonder if they are twins or twins, if exactly the same… It is then when reviewed, a placenta, one egg, two eggs, two bags…
The difference between twins and twins is how it has been fertilized the / egg/s, and are as follows:
The Twins pregnancy, those who are truly identical and in gynaecological terms known as twin pregnancy or univitelline, occurs when a single egg with a sperm is fertile and form a Zygote which then divides into two, developing two fetuses. Depending on the time of the division, i.e., if si ocurre occurs between the first and fourth day after fertilization, each fetus would have his placenta and its own amniotic bag, but if the division happens between the fourth and the eighth day (75% of cases), each fetus will have its own bag but they will share the placenta.
Each one develops independently, but to be formed by the same egg and the same sperm, they share the same genetic load and are physically almost identical.
The Twins pregnancy, bicigotico or bivitelino, is produced by fertilization of two eggs and two sperm, resulting in two different embryos that coincide in time.
In pregnancy of twins each fetus has its amniotic bag and its placenta and they may be of the same sex or not. Their similarity will be as the two siblings that they were born in different parities, and they are also known as fraternal twins.
Both in the case of being twins as twins, the children are United by a fact psychologically very significant, were born together.
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