Welcome to our group! I'm happy you're son is doing well. He's going to find that life without UC is great! I had Crohn's for 7 years before having surgery and have never regretted that decision for one second. It was the BEST thing I ever did!!
I agree with tbraz's recommendation for him to get up and walk as much as possible and to chew gum. That will help wake up the bowels. Once that happens, he will have a lot of output initially, so make sure they don't take him off of the IV fluids too quickly, because you don't want him to get dehydrated. The nurses should measure his input and output, and report it to the surgeon.
Please keep us posted on how he's doing, and ask us any questions you or he may have, and we'll do our best to help.
Dx'd Crohn's in '99 at 28. Proctocolectomy and ileostomy in '06.
Small Bowel Obstruction Surgery in '08, caused by adhesions.
Disease-free, medicine-free, and very thankful to be healthy again :)