D.H.
D. ~
I've been an OB nurse for 14 years. I have seen this many times, and not really any problems :) We usually watch to make sure that the baby pees, and sometimes the pediatrician will order an ultrasound of the kidneys after the baby is born just to make sure everything is OK. I'm sure the perinatologist will do more ultrasounds during your pregnancy to keep an eye on the kidneys and heart.
Everything should be just fine!
D.