Children eat lots of circle shaped foods – hot dogs, carrots, bananas, squash, zucchini, etc. While it's easy enough to dice them into disc sized bites (as shown), it's not always the safest thing to do. Choking can happen easily if the chunk of food gets lodged in the esophagus the wrong way.
A quick and simple way to avoid this is to always cut the food down the middle – making two long halves, and then dicing it up so you'll have half circles instead of full ones. And for neurotic moms like myself, take the extra step and cut them into quarters.