My son is 12 years old after wearing takkies on most occasions his feet swell?

Podiatry: He may have issues with the arches of his feet and therefore needs proper Podiatry assessment. He will benefit from properly fitted shoes from reputable places such as Shoe Clinic or Shoe Science.

Simple trial.: The short answer is, have him stop wearing the shoes for a while and see if his feet continue to swell. The long answer is, if they continue to swell even after changing to another style shoe, then have him evaluated.