A child’s low fever and vomiting followed by poor spirits is due to vomiting that causes the child’s gastrointestinal discomfort. A baby with low fever and vomiting may have gastrointestinal indigestion caused by a viral or bacterial infection, which is a gastrointestinal type of cold. If a baby has mild dehydration symptoms after vomiting, it can affect the child’s mental state. When a child has low fever, vomiting and poor mental state, the gastrointestinal function is generally weak, and low fever and vomiting may occur with improper diet or unclean food, or if the child has a cold stomach. It is advisable to pay more attention to keeping the abdomen warm and also to give the child oral probiotics to increase the intestinal flora. If your baby is vomiting badly or is not in good spirits and does not think about eating, you should also pay attention to viral encephalitis and meningitis central nervous system infections and seek medical attention. After the child is sick, he or she should take medication on time, pay attention to temperature changes, rest properly, pay attention to a light diet, and drink more water.