A one-month-old baby cries all the time during the day, and the possible clinical causes include indigestion, calcium deficiency, and unsuitable environment. 1. Indigestion: Parents’ feeding style is incorrect, feeding the child too much milk and causing indigestion, clinical manifestations of abdominal distension, abdominal pain, etc., this kind of situation will lead to the baby crying more than, it is recommended to adjust the feeding style. 2. Calcium deficiency: Calcium is an important element in the growth and development of newborns, when insufficient intake of nutrients caused by the lack of calcium in the body, the child’s neural excitability will be increased, and thus manifested in more than one crying symptoms. 3. inappropriate environment: if the child is located in the environment is more noisy, this situation will also cause stimulation of the child and crying, and is not conducive to the growth and development of the child. A month of the baby is always crying during the day, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.