The prerequisite for twins is that a woman ovulates two eggs, which are fertilized separately and give birth to two fertilized eggs in the uterus. An elder in my family gave birth to twins. According to research, if the wife is a twin, the probability of giving birth to twins will be much higher than that of ordinary people.
In addition to genetic factors, of course, some people use drugs, but this way may be harmful to the health of pregnant women and children, so I personally don't recommend it.
Few people have heard of twins, let alone triplets and quadruplets. It can be said that the probability of having quadruplets is 1/3250000, while the probability of having quadruplets naturally is one in 700000. From this data, we can understand how lucky it is to give birth to quadruplets.
On June 29th, 20021year, a pregnant woman in Dancheng, Zhoukou gave birth to a rare quadruplet boy, the youngest 1700g and the oldest 1900g. Birth time is only three minutes. The father of the quadruplets was very excited and incoherent, and he was also dumbfounding when interviewed. The father of quadruplets said in an interview that he already has two daughters at home, so he wants a son when he gives birth to his third child. I didn't expect the third child to be a quadruplet, all boys. For himself, these six children are the greatest wealth. At first, I wanted to name the quadruplets Guotai Min 'an, but considering that China has achieved Guotai Min 'an, I named the quadruplets Shengshi, wishing the great motherland prosperity.