Problems in pregnancy

Hey, this is my first baby at 17 weeks I found out he had a distended bladder, they put a stent in to help his kidneys and bladder work right, I'm just wondering if anyone has ever had this done? All of his test have come back normal, Down syndrome, chromosome, but his leg is bent still and hasn't moved yet, we did the stent two weeks ago.. My specialist said he sees 3 people like me a year. I know my baby is going to be ok I'm just worried about his leg...