The causes of crying in February include physiological factors, such as the environment, light, noise, diapers, bedding, etc., which need to be eliminated in a timely manner, as well as pathological factors, such as lack of calcium and indigestion. 1. Physiological factors: These include low or high ambient temperature, excessively dry air, too thin or too thick blankets, excessive indoor noise or light, wet diapers or uneven beds, hunger, etc., which cause babies to be uncomfortable and show the above symptoms. Parents are advised to eliminate the triggering factors in time to improve the above symptoms. 2. Pathological factors: first of all, consider the vitamin D deficiency, calcium deficiency, resulting in nervous system dysfunction, showing symptoms of crying. The symptoms can also be caused by the baby catching a cold, leading to digestive disorders, indigestion, can also show the above symptoms. Parents are advised to strengthen the daily care of the baby, find abnormalities in time to consult the doctor, under the guidance of the doctor to implement symptomatic adjustment or treatment.