The causes of fetal double kidney separation generally include physiological factors and pathological factors, if there is malformation present, timely medical treatment is needed. The so-called physiological factors generally refers to the fetus itself is not well developed, may also be caused by the fetus to hold urine, but if the separation of the two kidneys in the fetus within 1cm, usually belongs to the normal physiological separation phenomenon, will not cause serious impact on the normal growth and development of the fetus body, to be after the delivery of the fetus, the phenomenon of the separation of the two kidneys will be gradually restored. Pathological factors generally refer to fetal chromosomal abnormalities, because chromosomal abnormalities will cause double kidney separation, when the double kidney separation is more than 1cm is anomalous phenomenon, usually need to carry out fetal staining test or amniocentesis to determine whether there are chromosomal abnormalities. If there is a fetal abnormality