Pes planus in childhood is one of the most important reasons leading families to a physician. In the first three years, it can not be diagnosed because of the soft tissue structures under the feet. Most pes planus is flexible, and do not cause problems and treatment is not necessary. Rarely, more serious problems can arise due to pes planus. Careful attention should be paid and detailed investigations should be made in cases of Achilles shortness, problems related to ankle and sub-articular motion range, and pain.