Two year olds walking with inward eights need to be evaluated by a doctor, such as a visit to a pediatrician or a pediatric orthopedic clinic. In short, it is important to evaluate whether the baby is really inwardly or not, because inwardly walking often has to be considered whether it has O-shaped legs, which are the sequelae of rickets. It can be treated orthodontically when it is severe in childhood so that the child does not affect its image in adulthood. In addition, it is also important to see if there are other underlying causes, because children who have no problems with all aspects of feeding and nutritional status should not generally have severe rickets, and it is important to see if they have other calcium and phosphorus metabolism, other diseases of their own, etc., and should not be missed. Some may be related to the development of joints such as hip and knee joints, parents should go to the hospital if they think the child’s problems are related to the development of tendons and congenital diseases.