There is a certain genetic predisposition to conceive twins, but it does not mean that if you have the gene for twins in your family, you will definitely conceive twins, but the probability of conceiving twins is higher in such families. For example, after the age of 35, the ovarian function will gradually decline and endocrine disorders may occur, resulting in multiple ovulation or the discharge of two eggs at one time, thus increasing the probability of twin pregnancy. Nowadays, due to the use of IVF technology, the probability of having a twin pregnancy also increases in women who have used ovulation-promoting drugs. It has been reported that pregnancies 1 month after stopping the use of contraceptive pills have an increased percentage of twin pregnancies, which is the reason for the increased secretion of follicle stimulating hormone during this month. Some families believe that taking folic acid can increase the probability of twin pregnancies, but there is no clear scientific basis for this claim and further research is needed to determine its veracity. However, it is clear that folic acid supplementation during pregnancy preparation and during pregnancy can prevent fetal neural tube abnormalities and timely supplementation is beneficial for fetal growth.