15 months post tummy tuck and I still have swelling. Is this normal?

Most swelling is gone 10-12 months after a tummy tuck. Perhaps you are seeing excess fat or skin. You should see your plastic surgeon and see what he or she says.

Most people have completed their healing process by 12 month's time, but everyone is a little different and it is possible that you have residual swelling around your belly button, though not likely.  As far as the roll in the upper abdomen when you sit, this is not likely due to swelling and is unlikely to resolve.  If you have concerns about your tummy tuck, I would suggest you consider returning to your plastic surgeon to discuss your concerns and so that you can be examined.  Best of luck!

Generally most of the swelling should resolve by 12 months. I'd recommend going back to your plastic surgeon and see what he suggests. Good Luck!