Biparietal Diameter (BPD) is a crucial measurement included in fetal ultrasound. Through this measurement, doctors can assess the baby’s development and estimate the baby’s weight and size at birth.

If the biparietal diameter, the fetal head measurement, is larger than normal, a vaginal delivery could pose significant risks for both the mother and baby during labor. However, for more precise assessments, doctors will combine the biparietal diameter measurement with other fetal parameters, such as abdominal circumference and femur length.

Fetal head circumference is an important indicator, helping to assess fetal development, and at the same time detect abnormal signs of the baby right from the time it is in the mother's womb. This helps to limit the risk of birth defects in children, especially microcephaly.

Ultrasound is a key diagnostic tool used to monitor the development of the fetus and detect any potential health issues. If an ultrasound shows that the fetus has a smaller head than expected for its gestational age, it can be caused by a variety of factors. In some cases, the baby may still be growing normally and be healthy, while in other situations, it could indicate a medical condition or developmental concern. Regular ultrasound scans help doctors track the fetus's growth and ensure it is developing as expected.