When describing my surgery to Logan the day I got home, I explained that - Mommy was sick and the doctor had to cut my belly to fix me on the inside. I'm all better now but I still have an owie on my belly, so we have to be careful and not touch it or push on it.
Logan seemed to get it, for the most part. He was happy to hear the doctors "fixed" me, but wasn't happy to hear that they cut me. In fact, upon hearing that, he advised me (several times and very adamently), "Mommy, they cut you? You tell them 'No thank you doctors!' "
What a concerned little guy he is. ;-)