The size of the fetus is two weeks smaller than the actual gestational week, mainly based on the fetal head circumference, biparietal diameter, abdominal circumference and other comprehensive judgment results, need to be combined with the actual gestational age, parental size and other circumstances to consider, may also be related to chromosomal abnormalities, fetal growth restriction and other factors, need to promptly identify the cause and take measures. When the fetus has a small gestational week, the gestational week can be calculated first under the guidance of a professional doctor to prevent the gestational week from being calculated incorrectly. It is necessary to check the menstrual cycle, ovulation date, etc., and combine them with the fetal heart monitoring during ultrasound examination to make a specific gestational week calculation. If the small fetus is due to a miscalculation of the gestational week or if the parents are not tall, there is usually no need to worry too much and the pregnancy can proceed normally with regular maternity checkups to keep an eye on the fetal changes. If the fetus is detected to be small due to malnutrition, the pregnant woman should increase the intake of protein and energy to promote the normal growth of the fetus. After the above factors are excluded, non-invasive DNA test, Down’s syndrome screening or amniocentesis should be performed to clarify whether the specific cause is fetal anomaly, abnormal placental function, blood circulation disorder or other causes of fetal growth restriction. If the fetal abnormality is diagnosed, you should go to the hospital in time to closely monitor the fetal growth and development, and if necessary, terminate the pregnancy in time to avoid the risk of adverse pregnancy or fetal death in the womb. In addition, pregnant women need to avoid excessive stress, try to maintain a calm state of mind, and also need to ensure sufficient sleep time. In daily life, she should adjust her diet and eat more eggs, fish and meat to ensure adequate nutrition intake.