Sudden crying at night may be caused by environmental factors, intussusception, etc. It can be improved by providing a comfortable environment and air enema reset. Babies crying at night is mostly seen in babies less than 2 years old, the reasons are as follows. 1. Environmental factors: if the baby’s blanket is too thick, room temperature is too high, clothes are too tight, uncomfortable diapers, etc., will lead to sudden crying in the night time, you need to provide the baby with a good, quiet, comfortable sleep environment, to help the baby develop good sleep habits. 2. Intussusception: the disease may be due to intestinal peristalsis normal rhythm disorders, may also be the sudden addition of complementary foods caused by intestinal dysfunction, generally can be treated by enema reset, if necessary, surgical treatment. Clinical causes of the baby sleep at night suddenly cry more reasons, if the child cries more than, can not be pacified, we must promptly go to the hospital, in the doctor’s diagnosis, targeted treatment.