Fetal biparietal diameter of 8.0 at 28 weeks of pregnancy is normal. In general, the reference value of fetal biparietal diameter at 28 weeks of gestation is 7.24±0.65, and at 29 weeks of gestation, the reference value is 7.50±0.65. Fetal biparietal diameter of 8.0 is slightly larger than the reference value, and is considered to be normal. Ultrasonography is recommended to rule out fetal anomalies. Biparietal diameter is the distance between the two parietal bulges, which is the largest transverse diameter of the fetal head, thus, the biparietal diameter can reflect the development of the fetal head. When the fetal head is too big, it may be malformation, hydrocephalus and other conditions. At the same time, the fetal head is the largest part of the fetus, so if the fetal head is too large in relation to the caliber of the pelvis of the pregnant woman, it will lead to difficulties in delivery. Ultrasound can be performed between 20 and 24 weeks of pregnancy for systematic screening of fetal organs. Through ultrasound measurement of fetal biparietal diameter, femur length, abdominal circumference and head circumference and other biological indicators, the growth and development of the fetus can be monitored, and fetal malformations and other conditions can be detected in a timely manner. During pregnancy, you should pay attention to rest more, and at the same time, you should relax and avoid tension and anxiety, and if you have any discomfort, you should go to the hospital in time, so that the doctor can make a clear diagnosis and cooperate with the doctor to deal with the symptoms.