The average femur length of a fetus at 28 weeks of gestation is about 5.27cm, and if it is 4.93cm, it indicates a shorter femur length. Fetal femur length reflects the developmental situation, at 28 weeks of pregnancy, the average value of fetal femur length is about 5.27cm, if it is 4.93cm is shorter, it means that the child may have developmental delay, you need to actively supplement calcium and other nutrients to promote the development of the child’s skeleton, the specific need to follow the doctor’s advice. At the same time, the child’s biparietal diameter should also be observed to see if it is normal. If the length of the femur is 4.93cm at 28 weeks, it is recommended to go to the hospital in time in order to find out the cause of the disease and give targeted treatment under the guidance of the doctor.