3 months baby hands and feet keep moving may be normal, or may be pathologic, such as brain injury. 1. Normal phenomenon, when seeing food or favorite toys, sensitive expression, excited state will appear hands and feet. 2. Increased involuntary movements, most of them should consider whether there is a brain injury, in addition to the increase in hand and foot movements, most of them will be accompanied by asymmetric body posture, vertical head instability, see people can not take the initiative to smile, seldom make a sound, we should promptly go to the children’s rehabilitation department, if necessary, to do the evaluation and cranial magnetic and other related examinations. Under normal circumstances, 3 months baby hands and feet keep moving will gradually improve as the baby continues to grow up, if the baby grows up and still have this situation, you need to go to the hospital to do the relevant examination, in order to clarify the cause of the disease, usually to strengthen the baby’s care, to ensure balanced nutrition, appropriate sun exposure.