This is also what I am wondering. I have scanned all of my medical books and found nothing. (I’m a nursing student - nice to have the resources available in my home sometimes). I am especially concerned with my son, because when he initially presented with symptoms at 6weeks old, they initially thought he had kidney problems and actually had a slightly abnormal kidney ultrasound. They are still questioning if he may have underlying kidney problems that haven’t surfaced yet and are re-scanning his kidneys in March...