My son has a pair of Puro Labs BT2200 headphones, and I swear if the things were just a bit bigger, I'd probably use them as often as my own fancy adult-sized headphones. They feature dynamic 40mm drivers that deliver deep bass, rich mids, and clear highs, with audio clarity that makes listening to music, playing a game, or watching a show a pure pleasure.
As they feature excellent passive background noise reduction thanks to the padded ear cups and noise limiting at 85 decibels, they work well even in noisy environments without putting a kid's hearing at risk.
My son would likely use these headphones almost exclusively save for the fact that we experience intermittent issues pairing them to devices via Bluetooth connection. This is easily solved by use of a cord or by going through the whole forget and re-pair process, but it can be a bit of a frustration.