Fetal weight at 36 weeks of pregnancy is about 2500 g. Due to the individual differences of pregnant women and the growth and development of the fetus, it may be on the large or small side. Fetal weight at 36 weeks of pregnancy depends on the nutritional status of the pregnant woman. If the pregnant woman’s diet during pregnancy is not reasonable, and if she often eats partial food or picky food, it will lead to insufficient nutrient intake, which will cause the fetal weight to be lower than the normal value. However, during pregnancy, if the pregnant woman often eat some high nutrition, high sugar food is the phenomenon of over-nutrition, resulting in fetal weight gain too fast, increasing the burden of pregnancy. If the weight of the fetus at 36 weeks of pregnancy deviates significantly from the above range, it is recommended to consult a doctor in time, complete the relevant examinations under the guidance of the doctor to clarify the cause of the disease and treat the symptoms.