The reason why newborn babies cry at night may be caused by improper feeding, high body temperature, gastrointestinal discomfort and other reasons. 1. Improper feeding: newborn babies can’t get enough of breast milk due to too little secretion, and they will cry at night when they are hungry. It is also possible to feed too much breast milk or formula, overfeeding will be bloated and uncomfortable, will also be expressed in the form of crying. 2. Hyperthermia: The thermoregulatory center of newborn babies is not well developed, and high indoor temperatures or wearing too much clothing may cause an increase in body temperature, which may lead to crying at night. 3. Gastrointestinal discomfort: newborn babies do not pay attention to the warmth of the abdomen at night, the abdomen is cold after colic, or crying at night in the process of breastfeeding, swallowing a lot of gas caused by abdominal distension, can also cause colic, gastrointestinal discomfort will also cry. Newborn babies crying at night may also have other reasons, such as vitamin D deficiency, etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.