If the fetus is small in early pregnancy and all other tests are normal, the condition can be left untreated and regular pregnancy tests can be done. Pay attention to nutritious diet, eat more fresh vegetables and fruits, more lean meat, fish, eggs and milk, etc., which are good for fetal development. If the pregnant woman has some bad habits, such as excessive partiality and picky eating, it may affect the fetal development, so she should change all kinds of bad habits, pay attention to balanced nutrition in general, and not picky and partiality eating. If the fetus is really small, chromosome examination can be done for chromosomal abnormalities. If there are genetic factors, such as a family history of being short, the fetus may develop smaller. After pregnancy, you should have regular pregnancy tests, no strenuous exercise and avoid spicy, cold and stimulating foods.