Five-month-old babies always crying before bedtime may be caused by hunger, being frightened, indigestion, calcium deficiency and so on. 1. Hunger: five-month-old babies grow and develop faster, this stage of the baby to eat more milk, if not eaten before bedtime, because of hunger and lead to crying, delayed sleep. 2. frightened: may be caused by the baby was frightened, often insecure, difficult to fall asleep, fall asleep is also easy to frequent night waking. 3. Indigestion: often caused by improper feeding, when the baby indigestion, there will be abdominal distension, abdominal pain and other symptoms, affecting sleep. 4. Calcium deficiency: If the baby lacks calcium, it is easy to cause the cerebral cortex to be too excited, which will affect the sleep, and sleep is not stable. Five-month-old babies always cry before bedtime, there may be other causes, if long-term symptoms are not relieved, need to go to the hospital to find out why.