The normal value for 37 weeks leg length is usually 6.8 cm to 7.10 cm. 37 weeks leg length is generally the femur length of the fetus during pregnancy. Normally, the biparietal diameter at 37 weeks of pregnancy should be about 9 centimeters and the femur is about 6.8 centimeters to 7.10 centimeters. There will be some error in each baby’s development and there may be individualized differences. Femur length is an indicator of fetal development during pregnancy and will change as the fetus develops. Ultrasound measurement of fetal diameter is not 100% correct and may be affected by some subjective factors, such as clarity, doctor’s proficiency, etc. The reference value of fetal growth and development given by ultrasound data is only an average value. At 37 weeks of pregnancy, the fetus has reached full term, you should pay attention to your own physical condition, and closely monitor the fetal movement, appropriate exercise, in order to be fully prepared for delivery.