If the baby’s left hand is cold and the right hand is hot, it usually does not need special treatment. If it occurs for a long time and is accompanied by uncomfortable symptoms, such as abnormal sensation in the left hand, crying, etc., there may be abnormalities in neurological function, intracerebral lesions, and so on. First, the normal situation: 1, lifestyle: the baby’s right hand activity is greater than the left hand, the two hands in the environment temperature is not consistent, such as one in the quilt, one in the quilt outside, lying on the side of the right hand pressure, etc., there will be a left hand cold right hand hot, do not need special treatment, calm down or adjust the posture can disappear; 2, developmental characteristics: the baby’s nervous and circulatory system is not well developed, poor thermoregulation, may lead to unilateral, bilateral end-use sensation, and the brain may have abnormal nerve function, intracerebral lesions. May lead to unilateral, bilateral poor peripheral circulation, there are no other symptoms, parents should be observed, generally with age will disappear. Abnormalities 1, abnormal nerve function: can be caused by infection, developmental abnormalities, local nerve abnormalities can lead to left hemiplegia symptoms, such as facial paralysis, crooked mouth and eyes, temperature abnormalities, etc. Inflammation of the nerves innervating the left hand can also lead to temperature and pain disorders in the left hand, at this time, there are mostly sensory sensitivities reduced or elevated, pain and so on, and it is feasible to do a motor function and cerebral nerve examination, and it is recommended to treat the problem as soon as possible after diagnosis. 2, intracerebral lesions: such as brain tumors compressing the cerebral nerves can occur. Brain tumor compression of brain nerves can appear neurological symptoms, triggered by the left hand cold, right hand hot symptoms, with vomiting, mental anomalies, blurred consciousness, etc., cranial CT can confirm the diagnosis, mannitol can reduce intracranial pressure to alleviate the symptoms, surgical resection of diseased tissues as a radical cure; 3, vascular obstruction: the left arm of the vascular stenosis, etc., can be a lack of blood and oxygen supply, resulting in lower skin temperature, skin greenish gray, etc., for a long time there can be necrosis, angiography can be identified. Angiography can be identified, the need for timely thrombolysis or interventional therapy.