My son 1 month old now have swelling one one kidney. We did ec scan and there it is found renal split function as 62% for left kidney and 38% for right. Doctor asked to do surgey to remove the blockage. So, can we wait for the surgery? If we did the surgery now, will baby have pain after that? Will the swelling go away immediately  after surgery or will take some days or months? Can the renal function for right kidney improve more ?