My DD1 only has one kidney and is fine! I would say try not to stress until you talk to a dr (even if that is difficult). Also I was told that you only need 10% of one kidney to function, which I found amazing. However we have only ever had one uti and she is a perfectly healthy 4 year old.
My sister has gone through this with my nephew. When she was pregnant it was found that he had a dialated kidney. He had an ultrasound done when he was a few weeks old and it was still there. He had another test where they put dye in through a catheter in his urethra and they then wanted to operate on him. He was put on anti biotics (not sure what for though, I think it was to avoid UTI's) and he was observed for a year rather than operated on as they would have prefered him to be bigger. They just left here yesterday after coming down to see the specialist and he was given the all clear! It was a massive relief.
Fingers crossed it's nothing too serious for your little one
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