Under normal circumstances, the child’s lower limbs with the growth of age gradual changes, the early will show a slight O-shaped, is often referred to as the rollover legs, this situation to a certain age will gradually get better, and at a certain time there will be a knee extensor, that is, the X-shaped legs of this performance, the general age of five years old and gradually close to normal, so in a year and a half, you can see that the child will have a slight rollover legs, that is, the O-shaped legs, and the child will have to pay attention to the child’s lower limbs. O-shaped legs. But O-shaped legs to measure a value, that is, in the two lower limbs lying down condition, ankle joints naturally together, to see how much the knee spacing, the general knee spacing within 5cm is relatively mild O-shaped legs, do not need to deal with it, it can be said to be close to normal, especially fat babies may be more common O-shaped legs. This will gradually get better with age, to a certain age will appear O-shaped leg knee spacing gradually reduced, and X-shaped leg, that is, the knees together when the ankle joints will have a certain distance, this to the general age of three years old or so will gradually get better, five years old is basically close to normal, so the general in the age of three years old does not need to be dealt with specifically, to the age of five years old if there is no improvement to consider going to So generally within three years of age, no special treatment is needed. However, it is important to note that no matter whether it is knee spacing or ankle spacing can not appear more than 5cm, more than 5cm to consult a doctor.