A.S.
Why have they advised against the VCUG? It may give some insight as to why he is having recurrent urinary issues. Ask for a referral to a pediatric urologist to get better answers.
After your SWH: ETA
My daughter is 3 and prone to UTI's. She has been since she was 6 months old. We tried cranberry juice (not easy in an infant) and various non-medical treatments. We also did 2 ultrasounds that were normal before we were referred for a VCUG. She was diagnosed with Grade 3 urinary reflux and is being treated appropriately now. Recurrent urinary tract infections can lead to kidney infections, disease, and possible failure. I would get a referral to a urologist and see what they think. An ultrasound is a good picture of the kidneys and bladder but does nothing to show reflux.