A fetus with a separated renal pelvis needs to be examined to determine the condition. Renal pelvis separation is divided into physiological and pathological. In physiological pelvic separation, the fetus is holding urine in the uterine cavity and the pelvis is separated and dilated, but the value will not exceed 10mm, no special treatment is needed, and no abortion is required, and the baby will return to normal values after urination when it is born. Pathological separation of the renal pelvis is most often seen as a result of ureteral atresia, or ureteral stenosis. During pregnancy, you need to pay attention to review ultrasound. If it is not particularly serious, you can continue the pregnancy and wait for the baby to be born, you can treat it surgically, and if the separation of the renal pelvis is too serious, you need to terminate the pregnancy.