Fever is a common term in some areas for children who have a fever due to a build-up of food, mainly due to children’s weak digestive function and difficulty in digesting food due to eating too fast or too much. If a child has a fever after eating spaced food, the first thing to do is to adjust the diet and eat less and more often; secondly, parents can help the child by rubbing the belly button in a circular motion to speed up digestion; finally, they can also give the baby appropriate water. If the temperature is high, don’t forget to cool down the fever. It is advisable to seek medical advice and use fever-reducing drugs.