Ya - I explain to parents in my care that I know they are a choking hazard they drill that in at every CPR course ... however in reality so is FOOD and we still feed them we just make sure to properly SUPERVISE them while doing so and put strategies in place to minimize choking risk - aka you sit while you eat, do not talk with food in your mouth and so forth nothing different with any other 'choking hazard' the hazard is not the item but how the item is USED improperly that makes it a risk
I have a bin of 2000 marbles in my program that would likely make all of your hair stand on end watching an 18 month old play with them
I always ask parents before hand when I have changes in clientele if they are ok with them playing 'supervised' with the balloons and explain to them as Momof4 mentioned if they put them anywhere near a mouth the balloon turn would be DONE and if one pops I pick up all the pieces immediately!