Three months baby sleep always shaking head, stirring the reasons, as follows: First, consider it a normal phenomenon, baby sleep will appear shaking head, stirring action, because when about to fall asleep, occasionally the whole body muscle unnatural twitching, is in a shallow sleep state cortical inhibition and other reasons, resulting in unstable body function, this case is the self-adjustment of neural tissue is normal Phenomenon. Second, consider the baby was not timely supplementation of vitamin D after birth resulting in insufficient calcium intake, the baby’s body lack of calcium elements, resulting in increased sweating, head stimulation by sweat to produce itchy feelings, baby shaking his head to relieve head discomfort symptoms. Calcium deficiency will also lead to increased neuroexcitability in the baby, it is not easy to fall asleep, sleep, easy to wake up, stirring, crying symptoms, parents follow medical advice to give vitamin D supplementation, the above symptoms will slowly improve until disappeared.