Babies always crying may be related to physiological factors, environmental factors, digestive system diseases, skin diseases and so on. 1. Physiological factors: As babies are too young to express themselves verbally, if they are in a hungry state, it may lead to a situation where babies are always crying. In addition, when the baby urinates and defecates, if the parents do not change the diaper in time, the baby may also cry all the time. 2. Environmental factors: the baby’s thermoregulation function is poor, when the environmental temperature is too high or too low, it is easy to affect the baby’s sense of comfort, may lead to the baby always crying. 3. Digestive system diseases: when the baby suffers from digestive system diseases, such as indigestion, intussusception, intestinal colic, etc., may lead to discomfort symptoms, the baby always crying. 4. Skin diseases: if the baby occurs eczema, insect bite dermatitis and other skin diseases, will be prone to itching, irritability, sleep disturbance, etc., resulting in the baby always crying. The baby is always crying to rule out physiological causes, parents should take the baby to the hospital in a timely manner, after the cause is clear, under the guidance of the doctor standardized treatment.