Infants waking up easily may be caused by physiological or pathological factors. Physiological factors, such as shallow sleep, and pathological factors, such as calcium deficiency, can cause infants to wake up easily during sleep. 1. Physiological factors: when infants sleep, they are in light sleep for part of the time, and they still have partial response to external stimuli. When the external stimuli increase, such as the environment becomes noisy, hot and cold, the infants will be awakened from sleep. 2. Pathological factors: when infants have calcium deficiency, the excitability of the nervous system will be increased, leading to the symptoms of irritability, and the clinical manifestation of easy to wake up from sleep. In addition, calcium-deficient infants may also have symptoms such as easy sweating, loss of appetite and growth retardation. There may be other reasons why infants wake up easily, so it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.