Walking inside eight may be due to bad habits, may also be flat feet, vitamin D deficiency and other diseases. 1. Bad habits: usually when the baby learns to walk, not correctly grasp the walking posture or too early to stand, walk, there may be walking in the case of eight. And usually often imitate others walking in the appearance of eight, can also appear in the phenomenon of eight. 2. Flat feet: usually caused by congenital or acquired factors of the ankle muscle, ligament, tendon insufficiency. Most of the patients are asymptomatic, a small number of patients may appear ankle or lower calf pain symptoms, and can also be accompanied by heel valgus, X-shaped leg deformity and other conditions, which can also appear walking in the phenomenon of eight. 3. Vitamin D deficiency: usually due to insufficient food supplementation and insufficient sunlight. Patients often appear bone deformity, muscle relaxation and other symptoms, some patients can also be manifested as O-shaped legs, which can also appear walking eight. Some patients may also suffer from restlessness and excessive sweating. It is recommended that patients pay more attention to daily care and timely correction when the symptoms of walking inside eight.