During pregnancy, if the nutrition is not up to date, the fetus may be small and there may even be a chance of fetal growth restriction. In this case, it is important to assess how small the fetus is compared to the normal gestational week, and if it is only one week small, it is important to use dietary therapy as much as possible to avoid fetal growth restriction. When the fetus is less than 2-3 weeks below the normal gestational age, hospitalization is required to actively search for the cause, improve placental circulation, enhance fetal monitoring and terminate the pregnancy at the appropriate time. As far as possible, we should have small and frequent meals, and eat a high-calorie and high-protein diet, which can indirectly supplement the nutrition of the fetus, and will also prevent the fetus from being small.