Biparietal diameter is an important index in ultrasound that helps pregnant women monitor fetal development. This index detects fetal abnormalities.

The fetus reaches 37 weeks of age, the time of delivery is approaching, so pregnant mothers need to pay close attention to changes in the body as well as the development of the baby. One of the important ultrasound indicators of fetal morphology is the length of the femur of the fetus at week 37.