A fetus that is 2 weeks small, if it meets the criteria for fetal growth restriction, needs to be hospitalized for nutritional fluids while the cause is identified. Irregular menstrual cycles, resulting in an error in calculating the gestational week, or an error during ultrasound examination may cause the fetus to be small. In addition, if both husband and wife are small in stature, they may also be under the influence of genetic factors, making the fetus appear small during pregnancy. However, if a pregnant woman’s fetus is too small due to malnutrition and reaches the standard of fetal growth restriction, and she needs timely nutritional supplementation to prevent stunting, she should be hooked up to a nutritional solution under the guidance of a doctor. Some pregnant women suffering from hyperthyroidism, anemia, liver disease, etc., can also lead to small fetus, need to identify the cause and then treat. There are many reasons for the fetus to be 2 weeks small, need to do relevant examination to clarify the specific reasons, some need to be hospitalized to hang the nutritional fluid treatment.