Biparietal diameter of 97mm at 39+5 weeks is within the normal range and is not a serious condition, so pregnant women do not need to worry excessively. The normal range of the biparietal diameter around 39 weeks of pregnancy is usually 9.21±0.59cm, and a fetal biparietal diameter of 97mm is within the normal range, so there is no need to worry excessively. The size of the fetus can also be measured by combining the head circumference, abdominal circumference and femur length. If the fetus is too large, it may lead to difficulties in normal delivery and cesarean section will be required. If the fetus is too small, it may be retarded. During pregnancy, pregnant women should eat a balanced diet rich in vitamins and proteins, and ensure sufficient rest time to avoid overwork. Avoid coitus in late pregnancy, so as not to stimulate excessive contraction of the uterus, resulting in placental abruption, affecting the health of the body. Once the abnormal discomfort occurs during pregnancy, it is recommended that the patient go to a regular hospital for a relevant examination.