Some people have heard that it’s bad to wear used shoes because the sole might be worn unevenly. But when it comes to barefoot shoes, that advice need not apply. Barefoot shoes are already thin, flat, and flexible so wearing them doesn’t result in deformation of the sole.
That means you can safely pass down barefoot shoes to multiple children until they completely fall apart!
If you are concerned about fungus or bacteria, simply hand wash the shoes with vinegar and/or baking soda than dry them thoroughly (I use a vent dryer).