Fetal legs 1 week shorter at 30 weeks gestation is not necessarily dwarfism. Fetal legs 1 week shorter at 30 weeks gestation by ultrasound may just be due to poor embryonic development, which is related to the insufficient nutrition consumed by the pregnant woman. In addition, it may also be due to the embryo developmental delay, the examination error, so 30 weeks pregnant fetus legs short 1 week is not necessarily dwarfism. If someone in the family has dwarfism, the fetus should be on high alert for dwarfism, which can be diagnosed by non-invasive DNA, 4D ultrasound and amniocentesis to understand the development of the embryo. If the short legs of the fetus are due to malnutrition, timely nutritional supplementation is required. After that, the test will be repeated every one-week interval to understand the development of the embryo, and if problems are found or dwarfism is diagnosed, targeted treatment should be carried out under the guidance of the physician.