Fetal biparietal diameter 92mm fetal fetal weight is usually about 3 kg, but need to be based on fetal weight at birth, and the assessment of fetal weight also need to be combined with the pregnant woman’s uterine height, abdominal circumference, as well as fetal abdominal circumference, the length of the femur and other values. When a pregnant woman undergoes an obstetric examination and finds that the fetal biparietal diameter is 92mm, it usually means that she is already 37 weeks pregnant, and the weight of the fetus at this time is usually around 3kg, but the real weight of the fetus should be based on the weight of the fetus at birth. It is recommended to assess the exact weight of the fetus before birth, and also based on the uterine height and abdominal circumference of the pregnant woman, as well as the value of fetal femur length, chest circumference and abdominal circumference. Fetal weight usually reaches 3 kg when the biparietal diameter reaches 92 mm. Pregnant women are advised to get enough rest, go to the hospital for regular checkups and avoid coitus during this period.