Causes of vomiting and diarrhea in babies: first, improper feeding, consuming inappropriate food or eating too much, their stomach and intestines can not bear, so vomiting and diarrhea; second, babies suffering from gastrointestinal infections, such as rotavirus, norovirus infection or gastrointestinal bacterial infection, can show vomiting and diarrhea; third, babies suffering from respiratory tract infections or infections in other parts of the body, can also cause gastrointestinal symptoms Fourth, the child’s allergy to food, or primary or secondary lactase activity is reduced, can lead to vomiting and diarrhea. Fifth, climate change can cause vomiting and diarrhea in babies when they get cold, when intestinal peristalsis increases, or when the weather is hot, when the secretion of digestive juices decreases.