Twenty-day-old babies always cry, may be related to physiological factors, may also be due to calcium deficiency, skin eczema and other reasons. 1. physiological factors: for example, the baby is hungry, sleepy, defecation, urination, may lead to the baby feel uncomfortable, thus showing always crying. 2. Calcium deficiency: twenty days of the baby’s body if the lack of calcium, resulting in increased neural excitability, may cause always crying phenomenon, may also be accompanied by restless sleep, excessive sweating, easy to wake up and other manifestations. 3. skin eczema: common in the allergic body of the baby, in contact with pollen, dust mites and other substances, is likely to cause skin eczema, resulting in the affected area of the skin itching, pain, may cause always crying phenomenon. Twenty days of the baby always crying, 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.