I had my 19 week ultrasound last month. My first ultrasound in my first so far successful pregnancy. I found out that I'm having a little boy, but the next day my OB told me that my son has a dilated kidney. He didn't tell me much else, but that it's common in boys. I don't know what this means, but from what I've looked up it is common in boys due to their urinary system. The articles I've read say that it's caused by urine backing up into the kidney. It usually fixes itself before birth, but in some cases can only be fixed by surgery in the early months after birth. Has anyone else ever heard of this? I need some comforting words. I never expected to experience problems in my pregnancy. If you have any other information on this, please let me know.