If a four-month-old baby always cries before going to bed at night, the following factors should be considered:1. Some babies do not eat enough or eat too much before going to bed, which will lead to gastrointestinal discomfort, so there will be frequent crying symptoms.2. The sleeping environment is not suitable, if the indoor temperature is too high or too low, and if the baby wears clothes that are too little or too thick, which will also lead to discomfort before going to bed, and if the baby is not If the baby does not change the diaper before going to bed, there will also be abnormal symptoms. 3, some babies sleep with their parents for a long time, and some of them will have dependence, and if they lack the companionship of their parents before going to bed, they will have a sense of fear mentally, so they will have crying and screaming. Therefore, parents should clarify the cause of the disease to deal with the symptoms.