The baby’s left leg does not dare to make strength may be trauma, hip dysplasia or lack of calcium, should be treated for the cause of the disease, take surgery, medication and other ways. The baby’s left leg does not dare to make strength, may be traumatized, leg fracture, usually in the leg has obvious swelling, pressure and pain, showing crying, through the hospital examination film can be clearly diagnosed. If there is a fracture take immobilization, traction treatment or surgical treatment. Hip dysplasia may also be caused by hip dysplasia. Because of the congenital causes of hip dysplasia or hip subluxation, so the child’s legs do not dare to use the force, the symptoms are mild can be taken to do orthopedic exercises or sling fixation can be improved, if it is a serious subluxation needs to be operated. If there is a lack of calcium, the left leg will not be able to use its strength. It can be relieved by calcium supplementation. Therefore, if your baby’s left leg is not strong enough, it is mainly due to trauma, hip dysplasia and calcium deficiency, and you need to go to the hospital for examination and clarification.