The reasons for the formation of twins in the body are very complicated. In addition to the normal birth process, women also need to produce two eggs at the same time, which undoubtedly increases the difficulty of carrying twins.
Because twins can only develop from fraternal twins in the body, the conditions for forming twins are very harsh, and the probability of forming twins is lower.
As a special pregnancy phenomenon, the probability of forming twins through natural conception is very low. A large number of data show that the probability of giving birth to twins through self-conception is only five thousandths, and only 25% of these five thousandths are twins, and this phenomenon is artificially uncontrollable. There are few effective ways to increase the probability of having twins.
There is a reason for the low probability of twins. According to the reasons for the formation of twins, women need to expel two mature eggs when the ovarian function is normal, and the eggs and sperm will combine into fertilized eggs to form twins. Even if the embryo is successfully implanted into the uterus, it will face the test of nutrition, hormones, accidents and so on. It is extremely rare to have a pair of healthy twins.