36 weeks pregnant with a large abdominal circumference biparietal diameter small is mainly related to the physical condition of the fetus, each fetus is different, so the size is not the same, as long as there is no developmental abnormalities, the general growth and development of the fetus basically will not have an impact.
Under normal circumstances, at about 36 weeks of pregnancy, the biparietal diameter of the fetus is about 8.8 to 8.9 centimeters, but there are some differences, as long as there is no fetal oversize or undersize, there is no need to be overly nervous. However, if the biparietal diameter is too small, you should be on the alert for conditions such as microcephaly, and other tests should be done to clarify the diagnosis if necessary.
During pregnancy, you need to see your doctor regularly for ultrasound and physical checkups to understand your physical condition and the development of the fetus.