Yes my girl also got it recently when she. 11 months, her fever last for 3 days still never subside so immediately we bring her to my pediatrician and I really grateful to my pediatrician that she does a great job she immediately without fail , check her urine and blood test and of course antibiotics to treat my girl, she recover within 2 days and of course we go for ultrasound and mcu and show that she fine. dont worry baby boy usually got it it's becos the foreskin of the penis didn't clean properly , for my case my girl virginal hole close up and i dont even know , have you go for ultrasound to see the kidney? The professional tell me usually reflux can be notice thru kidney , if the kidney is bigger or swollen. I will pray for your baby boy to be fine.