The average value of biparietal diameter at 35 weeks of pregnancy is 8.70±0.55cm. Due to genetic and developmental reasons, there may be some errors in the measurement of different fetal biparietal diameters, which should be combined with head circumference, abdominal circumference and parents’ height to determine the size of the fetus, which is generally around 31.8cm for head circumference and 30.9cm for abdominal circumference. The size of the fetus can also be accurately determined by doing fetal 3D ultrasound. If the fetal biparietal diameter and head circumference are found to be significantly larger than the corresponding gestational weeks, attention should be paid to whether the fetus has normal intracranial development, including whether the lateral ventricles are widened and whether there is an increase in fluid in the posterior cranial fossa. If abnormal intracranial structures are found, further magnetic resonance imaging is needed to clarify the specific situation. If the fetus is developing normally, pregnant women are advised to control their diet and not to eat particularly sweet fruits and drinks to avoid difficulties in delivery due to excessive fetal growth. If both the biparietal diameter and the head and abdominal circumference are found to be significantly small, it is necessary to pay attention to whether the pregnant woman has nutritional deficiencies, and she can enhance nutritional supplements appropriately and increase exercise to promote fetal development. In addition, the pregnant woman’s blood pressure should be measured. If the pregnant woman’s blood pressure is >140/90mmHg, consider that she may have gestational hypertension, which can lead to decreased placental function and cause fetal growth restriction. At 35 weeks of pregnancy, it is also necessary to do fetal heart monitoring and pay attention to whether the umbilical cord is wrapped around the neck. If the umbilical cord is wrapped around the neck, pregnant women are advised to closely monitor fetal movement to avoid intrauterine distress due to fetal hypoxia. It is also necessary to pay attention to the depth and index of amniotic fluid and the position of the placenta to observe whether there is too much or too little amniotic fluid to prepare for future delivery.