The baby 18 months still can not walk may exist motor system dysplasia, nutritional absorption disorders and other reasons. 1. motor system dysplasia: under normal circumstances, babies can walk on their own at 12 months, 18 months and still can’t walk may be brain injury caused by motor system dysplasia, such as ischemic-hypoxic encephalopathy, which is a craniocerebral injury caused by perinatal hypoxia, the treatment includes supportive symptomatic treatment and special neuroprotective measures in two aspects, such as oxygen intake, appropriate restriction of the amount of fluids, control of glucose and subcooling therapy, etc.. 2. Nutritional absorption disorders: such as long-term lack of vitamin D rickets, etc., can also cause the baby 18 months still can not walk, can follow the doctor’s instructions to use vitamin D treatment; at the same time to give the baby the right amount of sunshine to promote skin vitamin D synthesis; to pay attention to if the intake of dairy foods, to ensure that the calcium intake is sufficient; serious deformities, feasible surgical correction. If the baby 18 months still can not walk there are many other reasons, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.