When my kids were little they were well behaved. A visit to the doctor’s office wasn’t a problem. We usually brought something along to keep them busy–books, paper and pens, etc. Nowadays I see tables and chairs, video screens and coloring books to entertain children waiting for appointments.
At home we had a “busy box” toy that served us well, but I’ve seen much more elaborate styles such as the ones pictured above, at crowded offices. Some parents might think this is a prime place for germs, but washing their hands before and after use should solve that problem.