My son was born with a hydrocele, just so you know it is also called an inguinal (sp?) hernia, same thing really. It just means the fluid from the stomach goes into the scrotum. Anyway, they usually go away by the time the child is 1-2 years old (I did tons of research) but sometimes they don't. My son was about 3 1/2 months old and his actually moved to one side (the left side went away on its own) and became really hard and big, we thought it had turned into a real hernia. So after we rushed him to the emergency room and found out it was not a hernia. A hernia is when the intestine goes down in there. So then when my son was 8 1/2 months we did the surgery to repair the hydrocele or inguinal hernia. We went with Dr. Roden, the reason he was chosen is because a very good friend of mines father was the CEO/VP of Children's Hospital in Dallas, he made the recommendation and knew Dr. Roden, he works out of Medical City and was a very good doctor, he told us every thing we needed to know and was very polite, I would us him again in a heartbeat and of course the recommendation coming from our friends father was even better. I hope this helps, don't worry too much, it took our 8 month old about 1 week to feel 100% better, because your son is 3 and much more active he will probably do much better. The incision was closed with the glue and he has no scar. Good luck and if you have any questions please feel free to contact me. My son is now 16 months old and you would never know he had any kind of surgery.