At 38 weeks of pregnancy, a fetus that is one month smaller than the gestational week is not necessarily a fetal abnormality. When the fetus is affected by factors such as parental genetics, examination errors, or miscalculation of gestational week, it may appear to be one month smaller than the gestational week, which requires the physician to recheck the gestational week. If there is no abnormality in the development of the fetus at this time, and if the indicators of the function of various organs are normal, the parents do not need to be concerned, and pay attention to maintaining a good rest, monitoring the fetal heartbeat on time, paying attention to the movement of the fetus, and being prepared to wait for the delivery of their baby at any time. After eliminating these factors, the small size of the fetus may be caused by malformation, fetal growth restriction and other factors. At this time, the fetus is not only too small and slow to develop, but also may co-exist with multi-system and multi-organ malformations, including structural abnormalities and dysfunctions. At 38 weeks of pregnancy, the fetus has already entered the late stage of pregnancy and may go into labor at any time. Pregnant women should pay attention to the number of fetal movements, as well as whether there are paroxysms of pain in the abdomen, and whether there is a large amount of fluid discharged from the vagina or bloody discharge. When the pregnant woman experiences regular and gradually increasing contractions, it indicates that labor is about to begin.