Baby shaking is common in the following cases: 1, belongs to the normal situation, because the baby is small, the cerebral cortex development is not yet perfect, the brain center on the limbs or trunk end of the action control ability is still poor, when the baby wants to hands to get something or focus on a thing, easy to appear limbs and trunk shaking. The phenomenon will disappear when the cerebral cortex is well developed and the control of the trunk is enhanced. 2, infant myoclonus, which is a manifestation of epilepsy, will appear without any cause for the baby to shake, sometimes for the limbs or body leaning forward, sometimes accompanied by purple around the mouth, eyes upturned, such as the above performance, to go to the hospital in a timely manner, if necessary to do EEG or cranial CT and other related tests.