When the baby is excited, the whole body will appear to be normal, because the baby is young, the development of the brain center is not perfect, for the body’s control ability is poor, when see easily excited things, the brain center can not be well integrated and differentiated, so that the whole body as a whole to make energy. With the growth of age, the brain center development gradually perfect, the baby’s differentiation of action gradually fine, will appear such as want to take something with the upper limbs precisely to get, rather than the whole body shaking phenomenon, so parents do not need to worry too much. If the baby still has this phenomenon after one year of age, it is a neurodevelopmental delay and needs to be seen by a hospital in time.