Walking barefoot is bad for a kid, really? Being a healthcare provider, I don't think so. But yes, you have to take care that your kid does not touch its foot so as to avoid infection spreading from there to any other site on its body.
Let me get you some good references. The first one is here.
Tracy Byrne, a podiatrist specializing in podopediatrics, explained in a recent Guardian article that walking barefoot helps children to build muscles and ligaments in their feet. It is also necessary for developing good posture, increasing strength, and improving children's awareness of the things around them.
A little precaution to be taken as mentioned here.
All things considered, it’s no wonder that you voted for barefoot walking as one of your top ten things to do before you’re 11 ¾.
a) Take a towel with you to clean your feet before you put your socks back on.
Did you know that there are 700 different types of soil in England and Wales alone? That’s a lot of different things to feel under your feet
c) Keep your eyes open for glass or other things that might poke you
Chiropractic health also recommends barefoot walking for kids.
Apart from the health benefits, there's something interesting about your kid's growth of feet as body part/organs. The research is here.
Research published in podiatry journal The Foot in 2007 suggests that structural and functional changes can result from the foot having to conform to the shape and constriction of a shoe, rather than being allowed to develop naturally. And the younger the foot, the greater the potential for damage.