Ultrasound 1 week older than the actual gestational week may be caused by shorter menstrual cycle, earlier ovulation, earlier fertilization of the egg or better nutritional status and development of the fetus, etc. This is a normal phenomenon and usually does not require intervention. At this time, it is only necessary to pay attention to the fact that the pregnant woman may have an early due date of 1 week, especially in the second trimester, and needs to have weekly ultrasound examinations and fetal heart monitoring to monitor the changes of the fetus at any time and take measures in advance. In addition, if the ultrasound reveals that the fetus is 1 week older than the actual gestational week, it also indicates that the pregnant woman usually has sufficient nutrition and the fetus is developing faster. You should pay attention to a regular diet, balanced nutrition, eat less and more meals, and control the amount of food and carbohydrate intake appropriately. Pay attention to rest, moderate exercise and avoid overexertion. If the fetus is 2 weeks older or younger, further examination is needed to determine if there is any fetal malformation or abnormal fetal development. If the fetus is significantly larger than the actual gestational week, first rule out diabetes, hydrocephalus and other diseases. If the fetus is too large due to over-nutrition, the diet should be controlled. If the fetus is significantly smaller than the actual gestational week, the fetus should be investigated for other diseases. If the fetus is too small due to malnutrition, the pregnant woman needs to supplement nutrition and increase dietary intake.