Hello YJL, we went through the VCUG three times now, my daughter is now 9. We discovered she had urinary reflux, which caused the some kidney enlargement. We had to do the VCUG to determine if the condition was getting better or worse, sometimes the kids can grow out of the condition. It was so hard to have my daughter go through this, but to her it was just a matter of getting it done so she could go to the toy store to pick out a prize (yes, I did use the /bribe system, this is a big one and it was worth it). I don't know where you live, we are fortunate to live close enough to Stanford Medical Center and the Children's Hospital. The first and third VCUG were done by the hospital, they were very good with my daughter, excellent in both pre and after care. The took us in a play room, showed us in kid language what was going to be done, made it fun and exciting. This made the day of the procedure a breeze. The first test was done at 21 months. You must do this test to monitor what is going on with the kidney. If the kids don't have intervention if there are issues, later in life this can cause heart problems and kidney failure. For us medically we had to stay on a very low dose of once daily antibotic for years. This too became routine, just a part of life. NOW, years later, we are off of all meds, the latest VCUG showed substantial improvement, min. scaring on only one kidney and no enlargement at all anymore. Reflux went from a grade 3 to a grade 1. Whew, we are on our way now, they expect the reflux to fully correct itself as she grows....no surgery. So, in summary, do the test, it is necessary to have a base line and to monitor what is going on, this test is the only way they can do this. You must avoid any urinary and kidney infections.....and recognize the sign if a bladder infections starts, before it gets to the kidney. The best of luck, request a mild tranqulizer for the baby (maybe one for you too,HA), and it will be over with soon enough, because the grow so quickly.