1, the formation principle of twins
Twins can be divided into two categories: one is identical twins, as the name implies, two children are born from the same fertilized egg; The other is fraternal twins, that is, two different fertilized eggs give birth to two children. If they are identical twins, the possibility of giving birth to twins is zero; And if it's fraternal twins, there's a half chance of giving birth to twins.
To have twins, the wife needs to ovulate two eggs at the same time, followed by the husband's X and Y sperm, and reach their eggs first to fertilize them. Then the fertilized eggs with XY and XX develop, that is, twins.
The twins are fraternal twins.
Twins are identical twins and twins are fraternal twins. The so-called fraternal twins, as the name implies, are different fertilized eggs, that is, there are two fertilized eggs. Usually in the process of fertilization, two eggs are implanted into the female uterus and fertilized at the same time, forming two embryos, each with a placenta and different genes. When one of their genes is xy and the other is xx, they are twins. In order to form two fertilized eggs, women need to ovulate two eggs at the same time. This situation is rare enough to show that fraternal twins are rare.
3. The probability of having twins.
The highest probability of twins in the world is between 10%- 15%, while the probability in China is around 5%, and the probability of twins is much smaller. The probability of twins is 25%. Because under normal circumstances, the woman only ovulates one egg every month, but in a few cases, she will ovulate two eggs, and both of them are fertilized, so she has the opportunity to have twins, so basically it is very lucky to have twins.
4. How to have twins
Twins have something to do with heredity. If you really want to have twins, you can find a spouse with a family history of twins. By eating folic acid and hormones, ovulation can be promoted in theory, but the risk is great. At present, the best way is to have twins and test-tube babies.
5. Grasping the ovulation probability is getting bigger and bigger.
1, close to the day of ovulation or the next day, it is easy to conceive twins, and it is easy to conceive twins after ovulation or 2-3 days before ovulation.
2, before pregnancy, correctly measure the basal body temperature, and the day when it suddenly drops is the ovulation day.
3. If you have regular menstruation, the ovulation period is about 14 days before the next menstruation, which is the ovulation day.