If the child suddenly appear limp, no obvious pain, still need to cause great attention, may just be the baby is playing with parents, may also be the baby suffers from cerebrovascular disease, occupational lesions, etc., need to find out the cause of the cause of treatment. 1. Playing around with parents: babies are active by nature, they may be in the process of playing on a whim, and deliberately make abnormal walking posture, parents should be more observant. 2. Cerebrovascular disease: If the child suddenly develops claudication, it is necessary to consider whether there are strokes, cerebral thrombosis and other possibilities, and can further improve the cranial MRI examination to clarify the diagnosis. 3. Occupying lesions: If your child suddenly develops claudication, you need to observe whether there is vomiting, headache and other manifestations, and you need to consider whether there is intracranial occupying lesions, and you can further improve the cranial CT, cranial MRI examination, and whether to carry out surgical treatment after the surgeon’s evaluation. When the child suddenly limps but does not have pain anywhere, parents need to be vigilant and take the baby to the doctor in time to clarify the cause.