The fetal biparietal diameter of 92mm at 37 weeks, i.e. 9.2cm, indicates that the head of the fetus is normal. The measurement of the biparietal diameter of 92mm is within the normal range, which does not indicate that the fetal head development is large, so the pregnant woman can continue to pay attention to the fetal development as long as she attends the maternity checkup on time. It can be used to observe the development of the fetus and determine whether there are any abnormalities such as cephalopelvic disproportion, so as to ensure a smooth delivery. Therefore, the observation of fetal biparietal diameter during pregnancy can help guide the choice of delivery method. If the biparietal diameter is large in late pregnancy, it is necessary to consider the possibility of hydrocephalus in addition to the factors of fetal overgrowth, and the pregnant woman should take measures under the guidance of the doctor according to the examination results. Therefore, pregnant women should pay attention to reasonable control of diet in the late pregnancy to avoid excessive fetal growth rate, which is not conducive to smooth delivery. In addition, pregnant women should pay attention to self-counting fetal movements and should have regular prenatal checkups and fetal heart monitoring to monitor the health condition of the fetus and the pregnant woman on time.