The reasons why a one year and three months old baby will not walk alone include lack of exercise and pathological factors. 1. Lack of exercise: one year and three months of the baby will not walk independently may be due to a lack of training, exercise, if this is the reason for the child to learn to walk more can be, the child walks are also learned, not born will be. 2. Pathological factors: for example, cerebral palsy, hypothyroidism and other causes will lead to the child’s developmental delay, movement disorders, there are also due to the child’s congenital deformities. The child is often accompanied by defects in speech, vision, hearing and intelligence. A one year and three month old baby who can’t walk independently needs to be actively consulted and treated for the reasons why the child can’t walk independently.