B.C.
All little kids have flat feet.
Arches become more pronounced as the baby fat pads gradually go away.
I have flat feet as an adult and my feet don't tingle.
Growing pains are typically felt in the long bone areas, not usually in feet.
Tingling and pins and needles sounds more like a circulation problem.
I think numbness would be more of a nerve damage thing.
See what the doctor says.