UTI/ bladder infection

Lindsey
Have any of you other moms had any issues with UTI/bladder infections? My girl is 6 months old and she had a bladder infection a couple weeks ago. We went back to make sure her urine was all clear after she finished it, and it came back positive for a different bacteria this time. Now all the same symptoms she had before have started up again. Just wondering if anyone else has struggled with these and what tests they run. We already had the renal ultrasound and everything seemed fine, but her doctor had mentioned that if she got another infection before age 1, that there would be more tests. Just curious what these other tests are and how invasive are they going to be?😕