The 42-day-old baby has been crying at night, considering the physiological or pathological factors, physiological factors such as discomfort in the external environment; pathological factors such as flatulence, colic and so on. 1. Physiological factors: when the external environment is too cold, too hot, or their own hunger, will make the baby feel uncomfortable, causing the baby to cry; in addition, some babies are prone to insecurity, when there is no parental appeasement, there will also be crying. 2. Pathological factors: 42 days of the baby, its digestive system is far from perfect, the night is prone to flatulence or even intestinal colic, causing the baby’s abdominal discomfort or pain, resulting in a crying situation. 42 days the baby has been crying at night, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.