The causes of newborn babies crying all the time include physiological factors, such as the environment temperature is too low or the cover is too thin, etc.; there may also be pathologic factors, such as indigestion, upper respiratory tract infections and so on. 1. Physiological factors: Because newborn babies are sensitive to the external environment, if the room temperature is too low or the blanket is too thin, they will easily be stimulated by cold and experience the above symptoms; they may also experience symptoms of constant crying due to hunger. 2. Pathologic factors: (1) Indigestion: Since the digestive system of newborn babies is not well developed, when they catch a cold or are overfed, indigestion is easily induced and they will show the above symptoms. (2) Upper respiratory tract infections: Due to the relatively low immunity of newborn babies, when parents do not take proper care of them, they are prone to upper respiratory tract infections, which may cause them to cry all the time, accompanied by respiratory discomforts of varying degrees. Newborn babies cry all the time, there may also be other reasons, such as abdominal inflammation, peritonitis, intestinal obstruction, etc., it is recommended to go to the hospital in a timely manner, complete the examination to determine the cause of the disease, and then under the guidance of the doctor to give targeted treatment or treatment.