Four-month-old baby crying for the following reasons: First, physiological crying, baby hungry or to defecate and other physiological needs caused by crying, timely treatment of the baby will be relieved. Second, intestinal cramps, the baby is often cold bloating, diarrhea and even intestinal cramps symptoms, baby tummy discomfort will also cry and restless, this time you can touch the belly, clockwise massage, you can also use a hot water bag local hot compress baby tummy, eat some probiotics such as mamma love to regulate the gastrointestinal tract function. Breast-feeding mothers should pay attention to the taboo, eat less fish and shrimp and stimulating food, so that the baby’s symptoms will be significantly relieved. Third, the baby lack of vitamin D caused by the lack of vitamin D baby will also appear irritable, crying and restless symptoms, timely supplementation of vitamin D symptoms will be relieved.