In children, fever is a common symptom of many different diseases throughout childhood. It can also be a child's reaction to environmental changes or external factors, especially in humid weather, which is favorable for the development of viruses and bacteria that cause diseases today.

When a baby is 6 months old, breast milk has enough antibodies to protect and prevent pathogens from causing disease. However, from 6-3 years old, the mother's immunity has decreased, while the child's immunity is still weak, making it easy for the child to get sick and have a fever.