Femur length between 56.6mm and 67.0mm at 32 weeks of pregnancy is normal, abnormalities should be clarified in time. The average femur length of a fetus at 32 weeks of pregnancy is 61.8mm. Due to individual differences in fetal development, femur lengths within the upper and lower two standard deviations are generally considered normal. Therefore, the lower limit of femur length at 32 weeks of gestation is 56.6mm, and the upper limit is 67.0mm, within which the fetus is considered to have normal development. If the femur length of the fetus is lower than the lower limit or higher than the upper limit of the normal value, the week of gestation should be checked again to determine whether there is any error in the calculation of the week of gestation and to approve the expected date of delivery, and further examination should be carried out to rule out the existence of fetal anomalies. If there are any abnormalities in the development of the fetus during pregnancy, further treatment can be carried out under the guidance of a medical professional if necessary to avoid an adverse outcome of the pregnancy.