My son is 18 months, and had the first part of his procedure done in September, when he was 14 months. He has the 2nd part done in May. He has to have two procedures done, because his undecended testi was still in his abdomen, and showed no signs of coming down. The procedure is called Fowler-Stephens procedure. There are several different procedures, there are different variables of the testi location that will determine which one takes place. Most procedures only have to be done once. And you may find, that your sons' is on it's way down, and you may not even require a procedure. They made 2 small incisions in my my sons abdomen and went in through his belly button. They severed everything holding the testi in place via lazer. The second part, they will pull it down. We checked in at 6:30am, and were on our way home at 11:00am. The roughest part was when he was coming out of the anesthesia. Just make sure to have a favorite blankie, or toy there, and some apple juice. He was running around like a mad man the next day. It, by far, hurt us more then him. Hope this helps!