FL refers to the femur length diameter, 34 weeks FL normal value is about 66mm, FL60mm is a little small, may be normal, but does not exclude pathological conditions such as fetal malformation. The FL can determine whether the development of the fetus is consistent with the days of menopause and whether the fetus is normal. Fetal weight can also be determined indirectly through the examination of femur length diameter. If there are genetic factors in the child, the parents are small in stature, the fetal heartbeat and fetal movement are normal, and the Down syndrome screening is normal, it generally indicates that the fetus is normal. However, if the short femur of the fetus is accompanied by other abnormalities, it means that it is abnormal and there may be developmental malformations. Pregnant women are advised to pay attention to balanced nutrition during pregnancy and ensure sufficient intake of protein, calcium and other nutrients, which are beneficial to the health of the fetus and the mother. If FL60mm is found in the 34-week checkup, it is recommended to consult a doctor in time, and under the doctor’s guidance, complete the relevant examinations to clarify whether there are any malformations in the fetus and take appropriate symptomatic treatment measures.