A fetus that is three weeks larger than normal will not necessarily go into labor early. The exact time of delivery has a lot to do with the pregnant woman’s own physical condition, and it does not necessarily mean that the fetus will go into labor early. The expected date of labor will not be advanced because of the large fetus, usually around two weeks before or after the expected date of labor is normal. It is usually not possible to estimate the exact time of labor, and pregnant women are very different from each other, so it is not possible to say that if the fetus is three weeks bigger than normal, it will be born earlier. If the fetus is large, it is also necessary to check the gestational week with the last menstrual period and early fetal ultrasound, so as to avoid errors in calculating the expected date of delivery. It is recommended that pregnant women pay attention to their diets to ensure balanced nutrition, reduce the intake of high-calorie foods, and can carry out a moderate amount of activities. At the same time, if the fetus is three weeks older than normal, you should also pay attention to whether there are other abnormalities, such as gestational diabetes or fetal structural abnormalities. It is recommended that you should have regular checkups during your pregnancy, listen to your doctor’s advice, and deal with any abnormalities as soon as they are found.