Fetal biparietal diameter of 9.4cm at 37 weeks of pregnancy generally indicates that the head is not big, and pregnant women are advised to take more rest and pay attention to a balanced diet and nutrition. Generally speaking, the fetal biparietal diameter at 37 weeks of pregnancy is 9.0cm, head circumference is 33.1cm, abdominal circumference is 32.7cm, and femur length diameter is 7.2cm, while pregnant women may have errors during abdominal ultrasound, usually at 37 weeks of pregnancy, the fetal biparietal diameter is within the normal range of 8.5~9.5cm, so the fetal biparietal diameter of 9.4cm indicates that the head is not big, which is within the normal range. Pregnant women should ensure enough rest during pregnancy and avoid overwork and strenuous exercise. You need to eat protein and vitamin-rich foods, such as eggs, milk, strawberries, apples, bok choy, cabbage and so on. Fetal biparietal diameter of 9.4cm at 37 weeks of pregnancy does not belong to head size. It is recommended that pregnant women should go to the hospital regularly for maternity checkups, and usually keep in a good mood, and need to exercise properly every day.