Fasting blood sugar of 5.4 mmol/L in pregnant women is not particularly dangerous. Diagnosis of gestational diabetes requires dietary control and physical exercise, otherwise it will affect fetal development as well as the physical health of pregnant women. Pregnant women are advised to go to the diabetes clinic, calculate the daily caloric intake to be consumed according to the body mass index, as well as the caloric allocation for each meal, develop an individualized and suitable diet plan, control caloric intake and control blood sugar according to the diabetic recipes. There should be no less than half an hour of physical exercise every day, to control fasting blood sugar ≤ 5.3 mmol/L and two hours after meal blood sugar ≤ 6.7 mmol/L, but control blood sugar ≥ 3.3 mmol/L at night.