Thanks for your query,based on the facts that you have posted it appears that your kid was admitted in St Johns Hospital Bangalore for UTI and was treated by antibiotics for couple of days was fine for few days.
You have not mentioned age of your child in your query.
Now he has recurrence of UTI.Recurrence of UTI in kids needs to be investigated to rule out few congenital abnormalities like Presence of Posterior Urethral Valve( PU Valve) or Vesico Ureteral Reflux.(VUR).
Please consult qualified Urologist
for clinical evaluation and get these done under his guidance
Further treatment will depend upon the final diagnosis.Till then continue the same treatment suggested earlier.