Fetal right kidney may be small because of congenital dysplasia, maternal malnutrition or disease, generally need to check the amniotic fluid regularly, observe the changes of the right kidney and appropriate nutrition. 1. In case of congenital dysplasia, ultrasound can be performed to observe the changes in the size of the kidneys and the presence of other malformations. Generally, one kidney is normal and will not affect the normal daily life, but if it is combined with other malformations, it may need to intervene in the course of pregnancy. 2. Pregnant women who are malnourished or have other diseases in combination need to monitor the changes of amniotic fluid in time during pregnancy. If the depth of amniotic fluid or amniotic fluid index is abnormal, or if there are abnormalities such as fetal growth restriction, it should be dealt with under the advice of the doctor. If the examination finds that the right kidney of the fetus is small, you should seek medical treatment and have it handled and treated under the doctor’s advice.