Fetus just one week on the large side is usually normal, but need to control the size of the fetus by controlling the diet and proper exercise to avoid the fetus getting bigger and bigger. The fetus is just one week large, indicating that the fetus has sufficient nutrition, which is normal, do not need to worry too much, but need to control the usual energy intake and appropriate exercise, such as less food, less high sugar, high calorie food. If the pregnant woman has diabetes, obesity, etc., more attention needs to be paid to control the size of the fetus. If the fetus deviates greatly from the normal number of gestational weeks, it is not conducive to fetal growth, nor is it conducive to the delivery of the pregnant woman, increasing the risk of vaginal delivery, easily complicated by post-partum hemorrhage, intracranial hemorrhage of the fetus and other symptoms. Therefore, pregnant women should try to control the size of the fetus within the normal range.