Looped legs, also known as lower limb knee inversion, or O-shaped legs. When one and a half year old babies appear O-shaped legs, usually can be treated with medication, orthotics treatment. 1. Drug treatment: O-shaped legs can be seen in pediatric rickets, etc., need to further clarify the cause of the disease, can improve the vitamin D, blood calcium, double lower limb X-ray examination. If there is vitamin D deficiency or calcium insufficiency, it can be appropriate outdoor exercise, and follow the doctor’s instructions to supplement vitamin D or calcium tablets. 2. Orthotics: If your baby has O-shaped legs, it is recommended to consult a pediatric orthopedic specialist to avoid bad postures in life, such as using a walker or standing too early, and at the same time, you can correct the leg shape by fixing the lower limbs in a brace or orthopedic insoles for the feet. When one and a half year old babies have O-shaped legs, it is recommended to go to the hospital in time for early treatment.