Children suddenly cry at night, may have environmental discomfort, shock, hunger, disease and other factors. 1. Environmental factors: the indoor environment is too cold or too hot, the baby sweating discomfort or cold body discomfort, crying, can promptly adjust the indoor temperature, increase or decrease bedding to ensure that the child is in a comfortable environment. 2. Fright: excessive excitement during the daytime play, contact with stimulating and scary things or parents make a lot of noise to affect the child’s psychology, night fright and crying. 3. Hunger: dinner is not full, or more exercise during the day, the middle of the night hungry and crying, you can add appropriate food in the middle of the night can not be fed too full, the right amount can be. 4. Disease factors: night cold cold nasal congestion breathing, or fever, abdominal pain and other symptoms, there will be night crying. You need to consult a doctor in time. Crying at night, a long time can not be relieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, standardized treatment.