My nephew is 8 now, and his mom only lets him wear these special orthopedic sandals to school and other places where shoes are required. - although she'd rather him be barefoot
... He doesn't have any foot problems or anything, but as a baby and
toddler, my sister was fanatical about him not wearing shoes, over concern for his feet developing properly, and attaining correct balance and flexibility, etc. She showed me several articles by different pediatric orthopedists.