Newborns crying at night may be physiological factors, such as hungry, environmental discomfort and other factors, but also may be related to calcium deficiency, cold and other pathological factors, the specific analysis is as follows: 1. Physiological factors: newborns who cry a lot at night, but no other adverse reactions, may be related to hunger and the surrounding environment is too cold or too hot and other factors, in the newborn feeding and change the surrounding environment, it will improve, without special treatment. 2. Calcium deficiency: If the newborn cries at night, and if it is accompanied by night terrors, excessive sweating, occipital baldness and other adverse phenomena, it may be related to calcium deficiency. 3. Cold and flu: If your newborn has a cold, fever, cough and other symptoms, it can also lead to discomfort and crying at night. Newborns crying at night may also have other reasons, it is recommended to go to the hospital in time for relevant examinations, clear causes and then actively treat the symptoms.