Twins can be conceived through natural conception or human intervention, but artificial intervention needs to be carried out under the guidance of a doctor with indications. 1. Natural conception: it may be related to genetic factors, such as a family history of twin births, etc. However, the chances of conceiving twins through natural conception are not very high, and women who are in good physical condition can only go along with the natural course of events, and there is no special method to ensure that twins will be conceived absolutely. 2. artificial intervention: need to have indications for the operation, such as polycystic ovary syndrome, need to be given under the guidance of a doctor to promote ovulation treatment, will increase the incidence of twin fetuses. Or other unexplained infertility after treatment still can not conceive when the artificial assisted reproduction, will also increase the incidence of twins, but does not absolutely guarantee that carry two babies. Twin pregnancy is a high-risk pregnancy, will increase certain pregnancy risks, such as high blood pressure in pregnancy, premature rupture of membranes, preterm labor, postpartum hemorrhage, etc., so there is no need for healthy women of childbearing age to force to carry a twin baby, just let nature take its course.