You must like seeing twin children in other families, and having two children at once is not a violation of the national fertility policy (now that the second child has been fully liberalized), and you don’t have to specifically have a second child later, so many families want to get pregnant with twins, or even triplets. With the advent of assisted human reproduction, the probability of twins has become greater, and there are even triplets and multiple births. The following is about the risks of multiple pregnancy, so please read it carefully and build a proper and safe pregnancy knowledge system. Multiple pregnancies are often associated with a variety of complications during pregnancy and delivery, posing a serious threat to the safety of mother and child. The incidence of spontaneous abortion and severe preterm birth (fetal failure to survive) in triplet pregnancies has been reported to be more than 25%, and the rate of perinatal morbidity and mortality increases significantly with the number of pregnancies. The risk of at least one birth disorder in twin, triplet, and quadruplet pregnancies has been reported to be 7.4%, 21.6%, and 50%, respectively. In order to reduce the risk of multiple pregnancies to mothers and infants, it is necessary to perform elective reduction of multiple pregnancies, which is required for three or more pregnancies in our assisted reproductive technology. Our center performs ultrasound-guided capsular puncture reduction with a success rate of over 95%, which is safe and effective. The best time for reduction is at 7-8 weeks of gestation (i.e. 32-39 days after transplantation). Generally, vaginal reduction can be performed at 6-11 weeks, and abdominal reduction is required above 11 weeks. Pregnant women can request several gestational sacs to be subtracted, such as 3 minus 2, 3 minus 1, 2 minus 1, etc., depending on the number of gestational sacs and the number of fetuses they wish to keep. For short stature, older age, uterine malformation, uterine fibroids or adenomyoma, history of miscarriage, it is recommended that it is safer to keep one fetus.