The baby shivered.

This is a very normal physiological phenomenon, because the baby's brain tissue is not yet fully mature, so the control muscle function is not perfect, and belongs to the subordinate position of the subcortical center and spinal cord in the function is relatively perfect, so the baby's movements are completed through them, and not completely controlled by the highest nerve, central cerebral cortex, only through the cerebral cortex control movement can achieve the most stable and coordinated, but also purposeful movement. Therefore, the baby often shows aimless involuntary muscle shaking, with the gradual improvement of brain function, the baby will show consciousness, purposeful this involuntary shaking will slowly disappear, give the baby some calcium and iron, etc., can drink calcium-iron milk powder, eat some egg custard, beet soup, more outdoor sun.