Pregnant women can control the size of the child through diet, exercise, etc. If the blood sugar is high it should be controlled. 1. Diet: the child is big, can be controlled by diet, usually avoid eating too high fat content of food, such as fried food, animal fat, eat less sweets, such as cakes, cookies, rice, noodles, steamed bread, bread and so on. If the child is on the small side, should have to eat more animal liver, eggs, milk, but also moderately more carbohydrate-containing foods, such as sweet potatoes. 2. Adjust the movement: if the child is big, you should increase the amount of exercise, such as walking, which can consume calories and reduce the growth rate of the fetus, if the child is small, it is recommended to rest, do not overwork, ensure adequate sleep. 3. Control blood sugar: If the pregnant woman has high blood sugar, the fetus will also have high blood sugar, which absorbs more calories and makes the fetus grow larger, this situation should be to control the blood sugar level, which can be controlled by diet, exercise, and if necessary, also need to be controlled by medication, such as insulin injection. Pregnant women should undergo regular obstetric examinations during pregnancy to observe the size of the fetus at all times and keep it within a reasonable range.