20 days old baby always crying, may be due to physiological or pathological factors, physiological factors such as hunger, insecurity, etc.; pathological factors such as intestinal flatulence, intestinal colic, etc., can cause infants to cry. 1. Physiological factors: more than 20 days of infants, it may be due to hunger, discomfort in the environment, insecurity and other reasons, the emergence of crying, in general, as long as more breastfeeding, more to appease the baby, can alleviate the baby’s crying. 2. Pathological factors: the infant digestive system is not well developed, prone to intestinal flatulence, intestinal colic, so that infants feel abdominal discomfort or pain, thus showing crying; in addition, some diseases such as upper respiratory tract infections, etc., can also make infants feel uncomfortable, crying performance. More than 20 days of infants 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.