Three-month-old babies cry a lot before bedtime may be due to hunger, environmental discomfort, illness, etc., mainly through breastfeeding, dealing with discomfort, medication and other ways to relieve. 1. Hunger: Babies are in the stage of growth and development, with high nutritional needs, which may lead to crying due to hunger. The main thing is to breastfeed, after breastfeeding can usually be relieved. 2. Environmental discomfort: If the baby’s feces and urine wet the diaper, causing him to feel uncomfortable, and then crying. Generally, the crying will be relieved after changing the diaper. 3. Disease: For the exclusion of the above physiological reasons, the baby crying, and crying and pain may be due to disease, such as colds and so on. Should promptly go to the hospital to clarify the cause of the disease, and under the guidance of the doctor for treatment. When three-month-old babies appear to cry at bedtime, attention should be drawn to the fact that, after ruling out hunger, environment and other factors, they should go to the regular hospital and follow the doctor’s instructions.