33 years old pregnant with triplets reduction is based on a combination of embryo location, rapid or slow development within the body, and single or double embryonic chorionic villi to determine whether to reduce one or two fetuses. Multiple pregnancies will be reduced through fetal reduction to reduce the embryo, improve the safety of fetal live births and reduce the risk of maternal pregnancy. 1. Embryo position: fetal reduction has certain risks and may cause the development of other embryos to be suspended, therefore, the clinically selected embryo for reduction must be the one that is closest to the puncture position and the easiest to puncture. 2. The development of triplets is fast and slow: often inconsistent, therefore, the embryo with the weakest vitality development will be selected for reduction. 3. Single and double chorionic villus: if two of the embryos are double chorionic villus, the double will be reduced instead of single, and the other single chorionic villus and single gestational sac will be retained. Pregnant women with triplets are advised to have close labor and delivery checkups and follow up treatment as prescribed by the doctor.