UTI in 15 week old


My son will be 15 weeks old on Sunday. We've noticed he has been fussy and he's a very content baby. His urine had a very foul smell yesterday. We took him to the hospital and the doctor finally did a urine sample through a catheter. We were correct, he does have a UTI and has to get an ultrasound done on his kidneys. He is currently taking medication and has started eating again and taking his naps. He seems to be getting better, but now I'm worried about his kidneys. Has anyone else gone through this or something similar?