oh you poor thing..im sorry i am no help to you but i have watched plenty of episodes of Maternity Ward (discovery channel) and it seemed to be quite a common issue in america..and it was always easily fixed with no major issues.
I know this probably doesnt put your mind at ease at all but just remember your bubba will be in the hands of experts.
My son was born with hydronemprosis which is enlarged kidneys and had to have surgery at 4 months of age and the doctors were amazing.
Good luck to you and your baby