5 year olds who have mild O-legs usually do not need to be corrected. If the O-leg is severe, it can be corrected by means of a brace. If a 5-year-old child has mild O-shaped legs, this is a normal physiological phenomenon during the child’s developmental stage and does not need to be corrected. With the development of the body O-shaped legs will gradually disappear. If forced to correct it, it may even affect the development of the legs. If a 5-year-old child has severe O-shaped legs, he or she can wear lower limb orthopedic braces to correct the problem, or wear foot-shaped insoles to correct the problem, and most of them do not need surgery to correct the problem at this stage. If a 5-year-old child is found to have O-shaped legs, it is recommended to go to the hospital for medical examination, improve the examination, clarify the cause of the disease and receive regular treatment.