Babies always crying before going to bed at night may be caused by underfeeding, over-excitement, illness and other reasons. 1. Insufficient feeding: it may be because the baby does not have enough to eat, due to hunger, so the phenomenon of always crying before going to bed at night. 2. Over-excitement: If the baby is over-excited before going to bed at night, it will lead to the cortical layer of the brain in a state of excitement, and can not sleep well, thus the phenomenon of always crying. 3. Disease: When the baby’s body is in a state of discomfort, such as fever, abdominal pain, nasal congestion, intestinal cramps and other symptoms of discomfort, there will be always crying before going to bed at night. There are many other reasons for babies to cry before going to bed at night, such as lack of nutrients, noisy sleep environment, etc. Parents should take their babies to the hospital in time to clarify the cause of the disease, and then give targeted treatment.