Baby 100 days old vomiting is usually caused by poor gastrointestinal digestion, and occasionally by intestinal obstruction or intussusception caused by surgical diseases. When too much food is eaten and the stomach and intestines do not digest, vomiting can occur, or if parents do not burp the baby in time after eating, the baby’s stomach is in a horizontal position after lying down, and the stomach and intestines do not digest well, so vomiting can easily occur when there is no digestion. When the baby’s abdomen is cold, it can also cause indigestion and weak gastrointestinal motility, which can also cause vomiting. Surgical system diseases include abnormal gastrointestinal peristalsis, intestinal obstruction or intussusception, etc. If the vomiting symptoms are heavy and the baby’s mental state is not particularly good, the baby should be taken to the hospital for detailed examination and treatment under the guidance of the doctor.