The main causes of nausea in newborns include indigestion and gastroesophageal reflux, as follows: 1. Indigestion: If the amount of milk eaten is significantly more than the digestive capacity, indigestion will occur. Indigestion can cause nausea and vomiting, and sometimes accompanied by abdominal pain, bloating, and other symptoms such as undigested milk flaps in the stool. For indigestion, the abdomen can be massaged clockwise to improve indigestion symptoms. Or apply anti-digestive drugs to deal with it, such as the application of Baohe Pills. 2. You can apply postural therapy to keep the newborn’s head elevated or take gastrointestinal motility drugs such as cisapride.