A child’s crying in the middle of the night can be caused by physiological factors, vitamin D deficiency, gastrointestinal discomfort and other factors. 1. Physiological factors: such as excessive hunger, changing diapers in a timely manner, thirst and other factors, can lead to frequent crying in the middle of the night, belonging to the physiological factors, eliminating the triggers can be relieved on their own. 2. Lack of vitamin D: children for a long time partiality and picky eating, resulting in a lack of vitamin D in the body, will often cry in the middle of the night, may also be accompanied by sweating, sleep is not solid, etc., when the child’s physical development will be seriously affected. 3. gastrointestinal discomfort: often eat too much food before going to bed or the abdomen is cold at night, there may be indigestion, will cause abdominal distension and abdominal pain and other symptoms, so that the child’s body is not comfortable, will often cry in the middle of the night. If your child is always crying in the middle of the night and the parents are unable to identify the cause, it is recommended that you seek medical attention for examination and treatment.