Mine are older now, 11, 13, and 23. So I can hand them just about anything and they know what to do with it. When they were little I had a bunch of those little flat plastic flashlights. Had one bare led bulb in it and had a press and hold switch buried under the plastic. Sorta like these.

https://www.amazon.com/Flashlight-Blackouts-hurricanes-emergencies-everywhere/dp/B07FW4Y2GK/ref=sr_1_2?keywords=flat+plastic+flashlight&qid=1555571810&s=gateway&sr=8-2

I’m sure you can grab them cheaper somewhere else. They also had a bunch of these as well.

https://www.amazon.com/WdtPro-Flashlights-Flashlight-Lanyard-Assorted/dp/B0776RW8DM/ref=sr_1_27?keywords=kids+flashlight&qid=1555571864&s=gateway&sr=8-27

Very floody, no concentrated beam of light to blind them or anything.

Thorfire makes these little lantern things. I have a couple. The kids love to use them now when they are camping out back in the woods.

https://www.ebay.com/itm/Flashlight-Mini-Key-Chain-Pack-of-10-ThorFire-Keychains-LED-Flashlight-Mini/253142579241

This guy has a bunch of them. Well worth the money. Not sure if Thorfire still makes them or not.

Just a few ideas.