What should I do if my baby has a separation of the collections of both kidneys? Double renal collecting system separation is an ultrasound diagnosis, that is, the width of the upper end of the baby’s ureter is wider compared with the normal value. If it is a mild separation of the renal collecting system, there is no need for special intervention, every six months to a year to do the ultrasound of the kidneys, follow up on the line, if there is no progressive enlargement can be without special treatment; if the separation of the renal collecting system is becoming more and more obvious, you need to consider whether there is hydronephrosis, if the baby is relatively small, and there is no recurrence of urinary tract infections, the mild hydronephrosis is also no need for special treatment. If the hydronephrosis obviously affects the renal function, or leads to recurrent urinary tract infections, pediatric surgery may be needed to intervene in the treatment.