In clinical practice, if a two-year-old baby develops X-leg, it can be diagnosed as having an external knee roll. The onset of the disease is due to congenital factors. When a baby develops this condition, it can be treated conservatively. It can be treated by leg binding, paying attention to the strength and also the tightness of the leg binding in order to avoid affecting the blood circulation in the lower limbs. Alternatively, electrical stimulation can be used, or suspension traction or hyperextension traction can be applied. Traditional Chinese medicine techniques, local massage, and wearing a knee valgus brace for fixation can also be used. Therefore, when a baby develops this condition, it is important to consult a doctor as soon as possible, so that the condition can be cured after the correct treatment is given by the doctor. The patient’s family should not dispose of the baby on their own to avoid aggravating the condition.