I never really had any serious illness when I was a kid. Oh, I had the usual run of colds and flu, and chicken pox, but really nothing requiring hospitalization or more than a few aspirin and chicken soup.
I only had a serious injury once, and at that, we were not sure how serious. I was not quite three years old, or so I'm told. I got a ride on the back of someone's bike, I can't even remember whose at this point. Somehow during the ride, my leg got caught in the back wheel, causing us to crash and hurting my leg. We visited a doctor, who took x-rays to see if it was broken. The x-rays were inconclusive, so they put me in a cast up over my knee anyway to be sure. What few memories I have of this are very vague at this distance, but I do remember wearing the cast and some inconveniences it caused. My mother was my caretaker for all of that.
That's it. No other breaks or sprains or anything worse than a cold or flu. I was a healthy kid who preferred reading to sports, so I tended to avoid those kinds of injuries. When I was sick enough to stay home from school, I parked on the couch with books and the TV for the day.