Four-month-old babies always crying during the day may be a normal phenomenon caused by the baby’s need, or it may be caused by indigestion, intussusception and other diseases, as well as other diseases such as gastroenteritis. 1. There is a need: four-month-old babies always cry during the day when the phenomenon, most of the four-month-old babies can not speak, in the affected children have hot and cold, hunger, defecation and other sensations, will be through the crying way to inform the parents, belong to the normal physiological phenomenon. 2. Dyspepsia: dyspepsia is mainly caused by gastrointestinal dyskinesia, visceral sensory hypersensitivity, and a combination of factors such as heredity and infection. Children will have symptoms such as abdominal distension, abdominal pain, burning sensation in the middle and upper abdomen, etc. When children have discomfort symptoms, they will always cry during the day. 3. Intussusception: The etiology of intussusception is not yet clear, and it is considered to be caused by the rhythmic disorder of intestinal peristalsis. The main symptoms of the child are paroxysmal abdominal pain, blood in the stool, abdominal mass, etc. When the child has abdominal pain and other uncomfortable symptoms, he or she will always cry during the day. 4. Other: gastroenteritis, colds and other diseases can also lead to four-month-old babies always crying during the day. Four months baby always crying during the day, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.