Pediatric flatfoot, also known as fallen arches or Pes planus, is a deformity in childrens feet in which the arch that runs lengthwise along the sole of the foot has collapsed to the ground or not formed at all. Flatfoot is normal in the first few years of life as the arch of the foot usually develops between the age of 3 and 5 years. Flatfoot can be rigid or flexible. Flexible flatfoot usually resolves without any treatment needed unless pain is involved. Rigid pediatric flatfoot however can cause joint pain in the leg when walking or an aching pain in the feet and usually requires intervention.