Newborns eating less may be caused by physiological factors such as frequent breastfeeding, or pathologic factors such as gastrointestinal disorders. 1. Physiological factors. Due to the frequent feeding of the child, short intervals, resulting in the inability to fully absorb the milk, resulting in the phenomenon of eating less. 2. Pathological factors. It may be caused by gastrointestinal disorders, thrush and other diseases. (1) Gastrointestinal disorders. Gastrointestinal disorders are caused by a cold abdomen, too much food, etc., which leads to accumulation of food, indigestion and other symptoms, resulting in the child eating less. (2) Thrush. As the child’s mouth is infected by germs, it leads to rupture of the oral mucosa and symptoms such as irritability and difficulty in breastfeeding. Newborns eat less, there may also 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.