Personally, I wouldn't worry about EDC for a five year old. He's not going to be alone that this age. He's either with you parents, or teachers, or a babysitter, or some other adult supervision. Expecting a 5 year old to know how to wash a cut and apply a bandaid is probably asking too much. The adult that will be with him will be better at that. A whistle will probably just get him in trouble at school, the temptation to blown it for fun is just too great for a kid.

For a ten year old, yeah, maybe you could start looking at some simple EDC stuff. But a five year old - not worthwhile or necessary IMHO. Kids this young aren't expected to go it alone, nor are they ready for the responsibility. That's why they have parents and other people watching over them all the time. These young kids are just along for the ride ... and to have fun!