A large fetus at 38 weeks of pregnancy should have a balanced diet, proper exercise, blood sugar control and weight monitoring to avoid giving birth to a huge baby. 1. Balanced diet: avoid high-calorie, deep-fried foods, choose foods rich in high-quality protein and low-fat, increase dietary fiber supplements, such as fresh vegetables and fruits. 2. Appropriate exercise: Under the condition that the body allows, reasonable exercise, can choose pregnant women yoga, pregnant women exercise, walking, etc. It is recommended to exercise 5 days a week, 30 minutes each time. 3. Control blood sugar: Gestational diabetes is one of the main causes of giant babies, reasonable diet should pay attention to blood sugar at the same time, such as high blood sugar, you can choose medication under the guidance of the doctor. 4. Monitor weight: Pay attention to the weight gain during pregnancy, the body mass index is different during pregnancy, the recommended weight gain range during pregnancy is also different, you can control the weight gain under the guidance of obstetricians. If there is a large fetal weight at the time of delivery, the baby should be evaluated by an experienced obstetrician before delivery and a relatively less risky delivery method should be chosen.