How much smaller biparietal diameter is a deformity

If the biparietal diameter is smaller than 3 times that of the same age, or the biparietal diameter is less than 10cm, the abnormality may be considered. If the pregnant woman has picky eating and partial eclipse during pregnancy, it may lead to insufficient nutrition supply in the pregnant woman, which may affect the normal growth and development of the fetus, resulting in a small biparietal diameter.

If the biparietal diameter is significantly small, accompanied by other indicators (such as head circumference, abdominal circumference, femur length, etc.), or there is abnormal development of fetal brain structure, it may indicate that the fetus has growth restriction, microcephaly and other problems.