When a baby is born, the knee joint is turned inward, manifested as “O” shaped legs, that is, the legs, after 1 year old children gradually learn to walk, the legs will gradually disappear, generally not more than 2 years old. The baby in the mother’s stomach, legs were curled state, after the birth of the legs, which is a physiological phenomenon. With the growth and development, the baby’s lower limbs muscle strength gradually increased, after 1 year old to learn to walk, lower limbs further exercise, rotator cuffs will gradually disappear, at this time attention should be paid to correcting the child’s walking posture, as far as possible without the use of walkers, can effectively improve the baby’s rotator cuffs. If the baby 2 years old still exists, or the condition further aggravated, need to timely pediatrics or orthopedic consultation, clear cause, take targeted treatment.